Come train with Rex - in person!!! rexdefense.com/

I'm new to the coated bullet world but I have gleaned a few things of note. One it's that the coatings actually drop velocity initially do to the significant drop in barrel pressure needing a change in your load to compensate. Second is that Molly has been shown to break down with heat and moisture potentially corroding the barrel over time. Last is that for the reloader like myself there are other products like hbn and ws2 with other properties that can be used to gain more consistency and wear protection from your gun.

Am in awe of this series.

Hi there. Great questions. If you have a new match grade barrel or even a new factory barrel, I would totally avoid any of the abrasive cleaners all together. The mechanical erosion forces that result from normal firing will do a more uniform job of removing micro-burrs and machining imperfections from the criticle areas in the bore. These cleaners can help to make the bore look more shiny, at least visibly, but you want to avoid removing any steel from the bore. Vid coming soon :-)

Another well done video. Really like the addition of the music at the end.

well let's see i purchased my Savage 110 FP in 1995 and started using Moly shortly there after. if you plan on using Moly after firing copper jackted bullets through the barrel then you have to remove all the copper fouling from the barrel. Sweet's 7.62 is the best solvent to accomplish this. after doing so you then use Neco Moly Slide grease on a patch and Burnish the Moly into the barrel. one of the advantages of Moly is that you can fire more rounds through the gun before you notice a drop in accuracy. another advantage is you do not need to use a brush to clean the barrel, you just run a patch with your favorite gun cleaning solvent and then a dry patch. you don't want to remove the Moly just the carbon build up. then you run a patch with the Neco Moly Slide Grease and Burnish the Moly into the barrel. most people who try to use Moly do so incorrectly and yes you will see a drop in velocities so you can bump up the charge 1.0 to 1.5 to get that loss back.i Moly Coat my own bullets. HTH.

Works great for lower velocity projectiles like the big bore .45s and .50s. If you are shooting LR with a 45-70, 45-90, 45-110 etc... this is a great way to go, especially if you paper patched them. For modern high velocity cartridges, lead cast bullets can make a nasty mess in your bore and will be problematic for maintaining a uniform level of fowling as they will require quite a stern bore cleaning regime.

If you already have treatment in the bore, that won't be a big problem. The big problem arises over long term use when an accumulation builds up in the bore and especially when further accumulation in differentially eroded pits is exacerbated by further deposition of the molybdenum which can really make a mess. One bore treatment prior to firing is fine and won't produce any significantly noticeable negative effect. You'll still get good accuracy and bore life, so I wouldn't sweat it :-)

You should try hex Boron nitride (hBN). It won't have the downsides that moly has, and resists far more heat. It doesn't rub off the bullets, and you can just coat the bore.

Thank you for taking the time to explain!

Love you music. Under the Ice my fav so far.

Thank you for the great vid!!!

Thx Rex, for another awesome vid!

Awesome video man....very informative

I've been moly coating for 30 years, but I always spray coat my barrels after cleaning, I see none of these issues. It's nice to look and have no copper in my lands. You do you I'll keep doing moly.

Awesome ! Go Rex go!

Thanks man. Thats my new mix of that song, I cranked up the guitars a little bit more this time.

Great video, I'm a little surprised that you didn't mention HBN coating. It seems to be the "latest & greatest" thing going.

good to see you again Rex

Hang in there, bud. I am at number 42 right now, and working on many more. I'll update my playlist. Stay tuned, new ones come out all the time.

I use moly quite a bit. after I clean my bores I mix some moly and rubbing alcohol. I then use a bore mop to run it through the bore. let the alcohol evaporate then run a patch through it to remove excess moly. one thing you didn't mention is the waxing of the bullets after applying the moly.

Great videos sir, I love the song at the end of the vid.

And a song writer and singer too boot... awesome!

Early days of moly coating, my how things have changed, I have used it after braking in my rifle and several years later and several thousand rounds the barrel is still good, cleaned after using and bore scoped, I will still be using it. No, you lose FPS as the pressure drops due to good lubrication and you normally had to up the powder to get it back to the start velocity, and it does not rub off bullets easy if done right, that why it is used to coat piston rings in engines. check the link below see what the pros say and what would they know it’s only their job www.wallworkht.co.uk/content/molybdenum-disulphide-coating/ Excellent lubrication - Completely dry lubricating film resists pick up of dust or other harmful contaminants. High load carrying capability. Reduced risk of seizure. Excellent adhesion to the metal substrate. Low coefficient of a friction alleviates stick slip behavior and provides uniform torque tension characteristics on threaded fasteners. High resistance to oils/fuels/grease. Enhanced corrosion protection in marine environments and to a broad spectrum of aggressive chemicals. Passive, containing no toxic lead or antimony compounds.

aahhhh!!! nooo where is the rest.. we want more we want more we want more. lol great set of videos looking forward to the rest. wish i had them all on dvd. cool to watch them from time to time in the shop. not to mention great reference material.

Rex thanks for the answers I knew you would have the scientific skinny. I have a cursory understanding of steel. Having worked and grown up with most family members working for Allegheny Ludlum Steel. Their stainless is so pure it is completely non magnetic. So for me it is going to be nitride and beer cans ;-)

Good vid.

I just purchased a brand new rifle and want to break it in what are your thoughts opinions on the Lubalox that nosler/Whinchester apply to their combined technology bullets? Should I break the barrel in with a standard bullet to establish copper equilibriam? I appreciate your input and have enjoyed your videos Thanks in advance

Nitriding really works. Nitriding the bore can act to interrupt one of the primary driving reactions of the chemical erosion mechanism - the adsorption and dissociation of carbon monoxide on the bore surface. Also nitrogen inhibits the subsurface diffusion of the free carbon into the steel as well. All this can lead to a significantly longer barrel service life. Eotvos effect can have an effect at long range on the order of inches. If you are shooting beer cans @>1KM, this is criticle.

it's fouling you friggin' Canadian! LOL! Good series, thanks

EXCELLENT videos for sure I'm currently doing a big multi-rifle long-term review of HBN coatings, to be published in Target Shooter and on my channel. When you lube the bullet, you end up reducing the fps. That reduction is, however, less than the drop in pressure. SO you could increase the pressure back up to where it was by increasing powder charge and have a nudge more fps, or leave it where it is, knowing you're running less pressure. Cheers Rex :)

Arjuna42 , if people using moly in their barrels either apply it straight to the barrel or using moly coated bullets BUT constantly CLEAN their barrel will they avoid problems ?

Finish the series! I really want to see how temperature affects your shot. Also, the cleaning video would be helpful.

Barrel Fowling!!! oh no how do little birds get into my barrel!!!! Ive heard of copper and powder fouling but never fowling. Lol I couldnt help it I laughed when I saw that spelling. Anyway these last few vids on internal ballistics have been very interesting, very informative and in depth. This is a great vid series and Many many thanks for putting all of this together and then distributing it for free. I would encourage you to make a DVD series of these vids, or maybe update and edit them if necessary, also maybe a book would be great. I know that is a huge undertaking but I would certainly buy them. Its great that they are on You Tube for free but sometimes Its nice to have a paper copy, A good sized book with illustration very similar to the vids would be a great addition to anyones firearm book library.

Hi Rex Really nice music and the vocals are just great. What a crescendo! Great vid too. Wondering if Nitriding the bore, new or low round count, does increase lubricity and extend bore life, or if it is just snake oil? Also how critical is the eotvos effect for our latitude? Thanks again for all your hard work and sharing spirit.

Love your vids Rex. Moleebdenum That's how it sounds.

Howdy! I would be extremely careful when increasing pressure on a shaky promise of lower pressures - if you know what I mean. The way the moly rubs off as it slides down the bore can vary considerably from shot to shot, so I would not increase the risk overpressure to get a little more fps. We will be precisely adjusting for bullet drop and windage anyways, so a higher MV is not really a top priority. Hope this helps.

I liked the music vid at the end

Hey Rex. I've been looking at different loads for my rifle and I was considering one from Federal that uses the trophy bonded tip bullet. This bullet is nickel plated but after what you said about moly coating I was wonder if the nickel plating will cause the same problem? Oh yeah, you make awesome videos...I've been sharing them with all my friends who have an interest in shooting.

I dont use moly coating because I dont think it's possible to coat the bullets with always the same amount of lubricant. Since it changes the friction a lot, it's the same thing for velocity and pressure. So a little change of moly amount between 2 bullet coating sessions will make your load out of tune.

Is shooting moly coated bullets in a hunting/predator rifle going to hurt it? And how often would the bore need cleaned?

Someone on this thread said that barrels can get up to 4000 degrees, perhaps only in a rapid fire MACHINE GUN, EXTENDED SHOOTING but really NOT in any other type of gun ! Does anyone have thoughts on this ?

I have use them while shooting handgun if you have the mold really cheap to do.On some of these bigger loads we push a gas check is used and lead build up isnt as big a issue. But was told I could go the same way with my new to me .300WM. Use half the power and might be able to extend the life of the caseing? and cut recoil down to something live able. Just dont know how far they will fly.

lol - yeah, you got me there. The old miners back in the old days used to call this stuff "Molly-be-damned" because it was a bugger to pronounce correctly. I guess I can relate to them guys.

u da man!

I'm my reloading book, it says moly coating decreases velocity. It's in the Lyman reloading book that came with my tumbler.

Rex, what about a thorough cleaning with VFG - WEAPONS CARE SYSTEM PELLETS saturated with JB bore paste. Then using their micro polishing paste. I plan to season the bore with NECO MOLY PASTE. It gets swabbed well with DRY pellets before firing. I have a MELONITE treated barrel which further reduces erosion. I used USMC Black Hills 77gr Siera King Moly COATED rounds.Does this sound like I am covered? Never use moly coated bullets during break in. Break in barrel totally before the Melonite.

you ever try boron nitride I think its called I hear and read its a high temp lube that can coat metals and chemical resistant

Chrome cannot be evenly applied to barrels. That’s why such barrels are less accurate than non chrome lined barrels, regardless of fouling or compromise of said lining.

That is a custom 6mmBR rifle built on a Surgeon action. Somewhere in my shooting video files, Blackrhino74 and I take this thing out and shoot it a bit. Check it out. Its a real nice shooter.

how about this analogy, remember when the razor companies starting coming out with shaving gel, iv'e had nothing but clogged razor blades from shaving gel and it doesn't wash out either, the stuff sticks like glue between the blades. standard cream is best =)

I was told by someone in the shooting industry that moly in rifle bores has been linked to corrosion.

Just FYI, engine and exhaust guys don't use moly as a thread lubricant because it becomes an abrasive at higher temperatures, something like over 800°F

Does this also apply to powder coated bullets?

I know you asking about moly + fmj bullets, but what about lead + moly bulletts.

I know this video is older, but have you looked at hbn coating? It's supposed to do what moly did, but better, with none of the drawbacks

Yes, sir - but bore lubricants are not effective for precision ELR applications. We will have to keep the bore fiction as consistsent as possible from shot to shot over the life of the barrel, so we will have a different way of treating the bore than we do on other rifles. :-) To be explained in full detail very soon

Part 2.....SBN is Salt Bath Nitriding. It is a treatment, not a coating. It is impossible to flake off or have anything get "underneath" since there is nothing TO get under. Anyway, Compass Lake has an explicit way they want the JB Bore Paste applied to their barrels under barrel break in. He said after break in and SBN, I could use moly coated bullets just fine as long as I kept the build up down. I know about the vinegar/hydrogen peroxide trick, then follow up with bore paste.Borescope too.

HBN FTW!

Will nickel plated bullets do the same thing as moly coated bullets?

Rock on. Get that cd. I want to buy it.

So I'm not quite sure what you're trying to get at. If I shoot moly coated bullets on one trip and not shoot them consistently, will my gun's barrel be alright?

Teflon (PTFE) I think is used to aid a bullet through body armour.

Coating bullets with Boron Nitride = Cold Bore shot Inside of the group. No downside like Moly. Reduces fouling and bore erosion too. Cheap and easy to do yourself.

what is mulbdeeum? is it like molybdenum?

Thanks for making this video. This makes good sense, how uneven deposition of the moly coating in the bore leads to uneven erosion. I've heard a lot of different opinions about molybdenum disulfide and this did explain the potential downsides quite well. There's one thing I'm curious about...my understanding is that the moly adheres to the bore more aggressively in regions with more microscopic pores, and at the throat where the bullet engages the rifling, and this is why the deposition is potentially so uneven and problematic after much use. 2 Questions; is there a way to just clean those deposits out of the bore, and more interesting to me, wouldn't the copper from a conventional bullet's jacket adhere in the exact same manner: unevenly, on account of inherent variations within the bore of the rifle? Why would moly buildup not be a better alternative to copper buildup? It reduces friction a heck of a lot more than copper and should still be doing the life of the rifle a favor in comparison to bare copper.

NO problems with Moly in my 220 Swift. 3700 degrees Kelvin in the bore @ 4:04 time frame, talk about melting barrels!

When do you think your next video will be ready? Quiro mas!!!!!!!!

what kind of rifle and set up is at 6:44

Great vid. So a 100 rounds of moly bullets shouldn't hurt my AR?

What song is playing at the end? I must download it!

Have you investigated Powder Coated bullets and Bore Erosion (handguns and rifles)?

After a THOUROUGH barrel cleaning check accuracy. Check for copper every 200 rounds with Bore Tech. Some barrels are super bad for collecting copper, and others are not. If u want to use moly then., use NECO Moly Paste to season bore as per their directions and shoot Black Hills moly .coated. Clean built up moly with soak of vinegar and hydrogen peroxide.50:50. Google my sentence before this one.

MolybdeNum (not Molybdeeum) instantly becomes a barrel destroying hard oxide as your gun is fired. You are far better off with a copper coated bullet. The soft copper will not damage your barrel and any residue is easily removed with the proper solvents.

Rex: muh LIB de num...Peace, bro

And hexagonal boron nitride works better.

With all due respect, how in the world did you determine the the molly coated bullet does an uneven job at coating barrel ? Is this substantiated by at least a few other people ?

Teflon IS monybdenum disulfide . Moly IS Teflon.

"Fouling", not "Fowling"

bad idea. You want clean OUT the build up of moly. How do you know your rifling is LOOSE? Not accurate? Accuracy of old surplus barrels are restored by JB Bore Paste, K-12 copper cleaner and Bore Tech cu++ copper cleaner follow up after k-12 to be used as an INDICATOR. No blue, no copper. The K-12 is best copper remover ever but has no indicator if any is left in barrel. use the BT cu++ for that. Good luck.

No kidding. Well, there are only a hand ful of top AR15 match barrel makers in the USA. Frank White of Compass Lake Engineering insists the use of JB Bore Paste on a patch wrapped around a bronze brush on their SS and unlined chrome moly barrels after the first 100 rounds and every 200 rounds after They even made a big deal of it in an email to me. I have it, use it and also their micro fine grit JB BORE BRIGHT. Besides, after break in my rockwell will be about 75 or higher after my custom SBN.

Hi Rex, Not to be a wise ass, but you are completely mispronouncing Molybdenum. You're saying Molybdium. President George W. Bush caught hell for saying Nu-cu-lar (Nuclear). Anyway I'm an Analytical Chemist and test Molybdenum in the vitamins and minerals by ICP-MS (Inductively Coupled Plasma-Mass Spectrometry). It's used as a catalyst in many enzymes in plants and humans. It has an atomic number of 42 (the number of protons). The rest of the weight is made up of neutrons (98 atomic mass units - 42 = 56 neutrons if you take the most abundant isotope). There is a contradiction, in your video, from some shooters that say it actually slows the bullet down. I have yet to test fire my reloads. Molybdenum disulfide (MoS2) is the compound used and does lubricate the bullet but apparently adds drag, but will look into it further. Just sayin.-Paul D. Dodson

hahahahahahahahah "some guy thought they were scary or something, so they banned it"...the definition of america!

*scared guy * Im gonna ban a type of round cuz i look scary!!!! RIP: Winchester black talon

Yeah, but a bit worse.

At the end you mention "good law abiding citizens". As the laws become more and more ridiculous good citizens may not be law abiding any more out of necessity. I would prefer to refer to them as peaceful citizens. Just a thought.

MOLY fanatics hate to hear they paid more and potentially screwed up their rifle....

You're wrong and don't talk about 'carnuba-wax,' that coats moly bullets.....

So pretty much don't do it lol.

Had a girlfriend named molly couldnt get rid of her just like ya caint scrub it out😅

Totally wrong on Moly coating . This is total B*ll Sh*t. It does NOT increase velocity for a given powder load . That means when you replace a non coated bullet with a moly coated bullet and the powder load stays the same the velocity drops . You have to increase the powder load slightly to regain the lost velocity . This happens because the in bore resistance has been modified and the pressure is reduced . The Moly does not bond into the steel in any detrimental way and any slight buildup can not build up more than the moly on moly molecular structure because the weak sulfur atoms allow the non bedded moly to just slide away as the bullet passes . Moly has a high coefficient of friction against the steel but a low coefficient of friction against it's own atoms . The stronger atom bonds give the moly it's load bearing ability . People look inside the bore and see a black ring and panic thinking they have a detrimental buildup and that's garbage . A normal clean with remove the none bedded moly . You don't want to clean too often with moly as that negates any advantage and you may as well not use it . Any slight build up is protecting the bore from flame erosion THAT'S HOW IT WORKS. I fire 300 odd shot in .223 with Moly bullets before I clean the bore . However that does not mean you put a gun away without putting some oil or grease in the bore and chamber as moly does not exclude oxygen from the steel like oil will . Why are you giving advice on a subject you know nothing about .

what the heck is "molebdium? There's no such material. Oh, you mean Molybdenum, an elemental metal. en.wikipedia.org/wiki/Molybdenum