Precision Rifle barrel talk, chamber, neck, throat, etc

Рет қаралды 34,594

3 жыл бұрын

MarkandSam Afterwork contact email...info@4aw.com.au
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Пікірлер: 119

@robertbenton6649 3 жыл бұрын

Thanks again for another great video! Information I will use. YT has been a annoyance to me lately but I am glad that you are still here.

@markandsamafterwork 3 жыл бұрын

Thanks Rob, and yep, I get ya, Cheers

@grizzlymullet2329 3 жыл бұрын

I have my first custom build at the gunsmith being chambered & fitted right now. It’s supposed to be finished the first part of September. I can’t tell you how excited I am! You have been a great inspiration and wealth of information. Thanks so much!

@markandsamafterwork 3 жыл бұрын

Awesome, hope its all it should be, Cheers

@aaronmclean8671 Жыл бұрын

I find your KZfaq channel being the best at informing someone into producing accuracy.

@markandsamafterwork Жыл бұрын

Awesome, Cheers

@dennisreynolds1510 3 жыл бұрын

One of the most informative videos I have seen in a very long time. I'm currently listening to a custom rifle building and long range shooting podcast to help me become a better shooter. Being relatively new to long range, there are a lot of terms they use that I just flat out don't know. This connects the dots perfectly. Thank you for your time! Cheers

@markandsamafterwork 3 жыл бұрын

Thanks Dennis, glad you liked and happy to help, Cheers

@jaybird9269 3 жыл бұрын

Do you happen to remember the name of the podcast?

@dennisreynolds1510 3 жыл бұрын

@@jaybird9269 Long Range Shooting and Custom Rifle Building Podcast. It's with Jamie Dodson from Wolf Precision Inc.

@jaybird9269 3 жыл бұрын

@@dennisreynolds1510 thanks bud

@crush3095 Жыл бұрын

I've watched like 20 videos on this topic, 18 of them just defined the tools and barrel terms two of them explained EVERYTHING, this is one of them

@markandsamafterwork Жыл бұрын

Thanks man, Cheers

@88hammar 3 жыл бұрын

Bravo!! Amazing video, everything was explained clearly and concisely. This video is a perfect example of why I look forward to your videos. Thank you for the content.

@markandsamafterwork 3 жыл бұрын

Thanks Man, Cheers

@walterwjr947 Жыл бұрын

Thanks Mate, you teach "hard", that was a "lot", I got it, I got it, explained a "lot", thanks...

@markandsamafterwork Жыл бұрын

Thanks Walter, Cheers

@oldschooljack3479 3 жыл бұрын

Thank you for more great information. It's light years ahead of where I am starting out at shooting wise. But as a former machinist I can appreciate all the technical jargon and associated intricacies.

@markandsamafterwork 3 жыл бұрын

Thanks Man, Cheers

@mikelaur3758 3 жыл бұрын

Thanks for sharing your knowledge. You help make it easier to understand.

@markandsamafterwork 3 жыл бұрын

Thanks Mike, Cheers

@neilmccormick9871 3 жыл бұрын

Highly informative! While much of what you discussed about the chamber I knew. The lands information was most helpful and thought provoking for me as I start my reloading and ELR journey.

@markandsamafterwork 3 жыл бұрын

Thanks Neil, happy to share, Cheers

@3guntactical622 3 жыл бұрын

Great video and very well explained! Thanks Mark.

@markandsamafterwork 3 жыл бұрын

Cheers

@timpaes 3 жыл бұрын

Awesome content, clearly explained and very educational information. Exactly what I was looking for.

@markandsamafterwork 3 жыл бұрын

Cheers Tim, thanks

@lorenlieder9789 3 жыл бұрын

Very good video for people that want to learn about custom chambering and rifle building for people just starting out.

@markandsamafterwork 3 жыл бұрын

Thanks Loren, means more than most coming from yourself, Cheers

@islamdo 3 жыл бұрын

Excellent,,, excellent video again Thank you

@markandsamafterwork 3 жыл бұрын

Thanks Islamdo, Cheers

@bobbymat2706 3 жыл бұрын

Thank you for your explanation, it was very informative.

@markandsamafterwork 3 жыл бұрын

Cheers Bobby, Thanks

@johndodge2684 3 жыл бұрын

Amazing information! Thank you so much for the detailed information. I’ve learned so much from your videos!

@markandsamafterwork 3 жыл бұрын

Cheers John, thanks

@oddursigurdsson3046 3 жыл бұрын

Great info and explanation, as always - thx a bunch :)

@markandsamafterwork 3 жыл бұрын

Cheers Oddur, Thanks

@blueridgeboy7721 2 жыл бұрын

Great video and content. Thankyou mark&sam

@markandsamafterwork 2 жыл бұрын

Thanks Man, Cheers

@archangel20031 Жыл бұрын

The Ackley improved does not shorten the case shoulder, it keeps it the same length so the standard round will still chamber, but it pushes the shoulder forward at a steeper angle allowing the factory case to fire form when being fired. If you do not want a brass sucker at the range to reuse your brass, get the chamber reamed for the Ackley improved shape, that way YOU can reload them for your gun, and it would be rare to find someone with the same chamber as you.

@markandsamafterwork Жыл бұрын

Cheers

@Jeff_Seely Жыл бұрын

Excellent explanation as you always lend, Mark. You answered many of my questions and I am clear on nearly all of it, thank you. One bit that I am not sure I am doing correctly is ascertaining how long my neck is in my particular chamber so I can calculate how much I should trim the brass back to for proper fitment after the neck grows to the point of needed trimming. I am not sure how to correctly measure the length of my chamber neck. Apologies if you've covered this. Thanks for your hard work on past and new material!

@markandsamafterwork Жыл бұрын

Should be to SAAMI spec, just have look it up, or at least that will do, Cheers

@wemcal 4 ай бұрын

Great video and great information

@markandsamafterwork 4 ай бұрын

Thanks Man

@davepartlow6430 3 жыл бұрын

Fantastic explanation. Thank you for posting this. I'm currently building a custom ELR rifle and will be using heavier, longer bullets. The 1 degree tapper of the lands was not something I was aware of (along with a lot of other stuff).

@markandsamafterwork 3 жыл бұрын

Thanks Dave, Cheers

@duggydo 3 жыл бұрын

Great video Mark. You are right about everything being particularly different. I have a custom rifle that the gunsmith messed up the chamber ever so slightly near the base. Every spent case shows very, very slight bulge near the base. He offered to redo for me, but it shoots amazingly. I would never have expected it, but the results don’t lie. Gave me a discount on the next rifle to make himself feel better.

@markandsamafterwork 3 жыл бұрын

Thanks Man, and yep, if it works well, leave it be, lol, Cheers

@BlueTJay 3 жыл бұрын

After watching your videos, I ordered a 85 Sako Classic in 7 mm RM. Sorry guys, i'm old school, I love wood! I also improved my target shooting skills. Never miss an episode and check out many old ones. I can rate this channel as on of the highest standards on the web!

@markandsamafterwork 3 жыл бұрын

Thanks Tom, and sounds good, enjoy, Cheers

@johnblythe8229 3 жыл бұрын

Great content Mark to questions I’ve always had. Finally back in the market with employment and a move from Atlanta Ga to Raleigh NC. A plus side to the situation - a 1000yd range 50 mins away 💪. My best to Sam.

@markandsamafterwork 3 жыл бұрын

Awesome, great to hear John, all the best to you mate, Cheers

@aussiesteveakastevecallagh2280 3 жыл бұрын

Great video Mark thank you.

@markandsamafterwork 3 жыл бұрын

Cheers

@bradb.4570 2 жыл бұрын

I am just so fascinated by all this 😂. I’m so glad I’m going to school for gun smithing! So much info thank you 👍🏻

@markandsamafterwork 2 жыл бұрын

Awesome, thanks Brad

@glockparaastra 3 жыл бұрын

Very interesting, thanks mate.

@markandsamafterwork 3 жыл бұрын

CHeers

@nathanielgray4235 2 жыл бұрын

Amazing

@markandsamafterwork 2 жыл бұрын

Cheers

@caryharbater262 Жыл бұрын

Terrific video, great instructions, just got Savage Elite Precision rifle in 300prc. Going to reload brass. This helps me to better understand how measuring and changing COAL to match my specific gun with bullet jump etc. truly matters for peak performance. Put 30 rounds through the rifle on Thursday, 0.8 moa at 100yds. Looking to get ARATEC mount, scope has 35mm tube. Anyway, thanks for all of the information you provide for ERL newbies. You and Sam are awesome.

@markandsamafterwork Жыл бұрын

Thank you Cary, Cheers

@samjohnson3124 2 жыл бұрын

thank you!

@markandsamafterwork 2 жыл бұрын

Cheers

@MikelLee 3 жыл бұрын

Thanks for this! Good stuff. Looking to order some of your equipment. Really like the look of your bag base will be ordering one. Just got a Bergara H-14 HMR in 6.5 PRC and looking at a similar rifle 300 PRC. Watching your 300 PRC results with interest. Great work on all of your videos, thanks again mate!

@markandsamafterwork 3 жыл бұрын

Awesome, great to hear, glad you like the videos, Cheers

@vk2let 3 жыл бұрын

very interesting video.

@markandsamafterwork 3 жыл бұрын

Cheers

@shooterspk5052 Жыл бұрын

Nice info

@markandsamafterwork Жыл бұрын

Cheers

@bamaverick8740 3 жыл бұрын

Love your content! A Cartridge has four components: Case, Projectile, Primer and Powder. All separate and not called a bullet. From a Industry manufacturer just trying to help with new shooters on nomenclature . We have enough people here in the United States using the wrong words describing ammunition and firearms. We are fighting everyday to conserve our 2nd Amendment Rights here in the US! I have been a follower for over 5 years keep up the great content and You and Sam keep shooting far and God Speed!

@markandsamafterwork 3 жыл бұрын

Cheers

@bobwiese6128 3 жыл бұрын

Awesome video as always!! Come on people, Hit the Like!!

@markandsamafterwork 3 жыл бұрын

Thanks Bob, Cheers and all our best.

@robertreynolds9228 3 жыл бұрын

Hey Mark how ya doing mate? I will donate to your channel at end of month mate. Im in Hope Valley California at the moment doing some ULR with some experimental gear. When i get back to east coast i will help out a fellow hammer dropper. Cheers to ya.

@markandsamafterwork 3 жыл бұрын

Thanks Rob, awesome, and hey only if it suits, but sure appreciated, Cheers and all our best.

@DCFusor 3 жыл бұрын

My experience has been that anything resembling a loose fit - either in the main chamber, or in jump to the lands, tends to degrade accuracy. For me - and I don't do ELR, just benchresty kinds of things - perfect alignment of the bullet to the bore is what makes the magic. That can't happen with any kind of "rattle fit" anywhere. For guns in the collection that do have a long run to the lands - TIR in the ammo is insanely important, as is fire-forming the brass if the chamber is a little loose. In the former case, if the bullet doesn't start straight (angularly) - the pressure by the time it gets to the lands means the projectile just deforms - and then will never fly straight. If the brass is a loose fit - well, even if things are straight, we didn't start in the middle. Heck, if the neck of the chamber is big, then non-uniformity in the brass' neck thickness matters more! In ELR where you're pushing the pressure limits, you have to compromise a bit to keep from having too-high pressure peaks at the start of things, that will deform even straight projectiles. I suspect the shallower angle Mark is using helps there. It must work, as the equivalent MOA Mark is getting is pretty impressive!

@markandsamafterwork 3 жыл бұрын

Hi Doug, well yes a loose fit is not ideal, but as said, too tight to chamber is a no go, but in there is all the explanations that should make sense to most, Cheers

@ruhurtin4squrtin34 3 жыл бұрын

doug: spend $ on lapua brass. then ur jibber jabber is a non event.

@hazcat640 3 жыл бұрын

I'm having a 257 Roberts built right now. Cut rifling at a 1 / 7 twist and having it throated to 2.95 COAL. This will allow me to get better velocities at lower pressures. SAAMI is 2.778 but if you research Roberts actually built them with a 3 inch COAL. I should be able to push a 115 grain Partition at 3000 fps without going over pressure.

@markandsamafterwork 3 жыл бұрын

Awesome, Cheers

@G5Hohn 3 жыл бұрын

Most of the modern chamber drawings I've seen are using 1.5° in the throat, although as Mark mentions, the 1° is also common on custom reamers. I prefer the 1.5 just because several bullet makers are now assuming 1.5 with their ogive designs (Sierra in particular). I think Berger does too. I'm not a good enough shooter to tell the difference between 1 and 1.5. Very gradual angles sure can make it harder to define where the lands actually start because the axial distance of a couple thousandths is just a couple tenths of diameter and you'll end up with a lot of OAL variation on repeated measurements.

@markandsamafterwork 3 жыл бұрын

Cheers

@sterlingwilkey2124 3 жыл бұрын

All wise and all knowing Mark, another awesome video. Question for you. I've seen custom rifles in 308 Palma, what's the difference between it and a 308 win. And what is the advantage on a rifle that normally uses large rifle primers that uses small rifle primers

@markandsamafterwork 3 жыл бұрын

Designed to try to gain more accuracy if used correctly, but little difference to the normal reloader in the average rifle, Cheers

@ruhurtin4squrtin34 3 жыл бұрын

308 palma has small primer which is supposed to burn more efficient is the rationale

@donaldpage607 3 жыл бұрын

Another question: I mostly understand reaming and shaping/forming neck and throat profiles but is anyone reaming undersized then using a process such as abrasive lapping to complete the size/shape. Is that even possible?

@markandsamafterwork 3 жыл бұрын

No, not something that is done, would cause many issues, Cheers

@audiogod2929 2 жыл бұрын

I have a 300 win mag on Remington 700 action rifle that was built by Mcree customs. it will shoot any box ammo off the shelf with no issues. the problem is when I reload. I am full-length resizing brass with 2 thou of shoulder bump. on reloads, I will get a few rounds that are very difficult to eject. Any idea what I should look at?

@markandsamafterwork 2 жыл бұрын

Your gunsmith.....Cheers

@genedavis759 3 жыл бұрын

Does it make any difference the spiral direction of the tool relative to direction of rifeling?

@markandsamafterwork 3 жыл бұрын

@lohikarhu734 3 жыл бұрын

Do you differentiate a "bullet", the projectile, from what seems to be called a "cartridge", the complete case,primer, and bullet assembly? Some people seem to make a "thing" of it....

@markandsamafterwork 3 жыл бұрын

Well yes correct term is cartridge, round or even ammo, but everybody still say bullet on occasion, lol, Cheers

@jeffjefferson2676 3 жыл бұрын

Do you use a floating reamer holder? I think that when you use a chamber reamer stop like the MARS reamer stop, you can make a very precise chamber in one go. As long as you flush from the front to the back of the barrel, the temperature can be held very precisely. Of course when you do it by hand you can have differences in feeding speed. But i think the resuls will be very precise and "on the dime". SAAMI also specifies the angle of the throat, and the distance of the free bore, so as long that is being held, normal rounds should fire very well. I like how you explained the importance of the throat angle and free bore distance, and the relation of that with the bullet length. Now, how do you like seating your bullets in the case? Ive heard/read that a lot of guys like to have it touch the lands, and that makes a good handload. Good video, i liked it. Greetings, Jeff

@markandsamafterwork 3 жыл бұрын

This is a general video to help people understand, not trying to be a gunsmithing video, lots more involved, and as said, I get another smith to do most of that for me, so not something I would get into, as for seating, a fare few years ago folks would push right up on the lands, not so much now, but, there is a lot to that also, we have a few videos on various parts of handloading, maybe check them out, Cheers

@buschdogproductions 3 жыл бұрын

Hey Mark. What's your process for determining your freebore after you've determined what bullet/ chamber you're going with? I know I've seen in other vids that you go for 20 thou off the lands a lot but I'm still unclear of how you settle on the initial OAL to get started on determining the proper freebore and such. Sorry if this is in another video. I'm still catching up on your channel but thoroughly enjoying it! Keep it up guys!

@markandsamafterwork 3 жыл бұрын

The link on the video is for a video on that, Cheers

@buschdogproductions 3 жыл бұрын

@@markandsamafterwork Thanks for pointing that out. I was oblivious the link existed. It's not obvious while watching on a phone I guess. In case anyone else is blind like me here it is. kzfaq.info/get/bejne/oqd2ms2qmc6Umqc.html

@markandsamafterwork 3 жыл бұрын

Cheers

@DenverLoveless 3 жыл бұрын

I don't know how I missed this particular video (No notification possibly?) Anyhow, I guess a wooden dowel wrapped in 600 grit sandpaper isn't going to be a very precise throat extender.... Oh well... I dont mind waiting on 5000 rds to get it there naturally (cringe) LOL ! Great explanation btw. Edit: Novices need to know this so they don't try loading a 200 grain bullet in a factory chambered .308 barrel, because that's what "the pros do in their videos" and then wonder "what's that crunchy noise when I seat it?" and why their popping primers with light charges and possibly much worse.

@markandsamafterwork 3 жыл бұрын

Lol, glad you liked, Cheers

@COLDSTONEMAN 3 жыл бұрын

How many inches does your gun smith take off each end of new blank

@markandsamafterwork 3 жыл бұрын

Depends on the details, not a question that has a specific answer, sorry, Cheers

@johnlebowitz6458 3 жыл бұрын

Do you have any thoughts on structured barrels? Thanks John Lebowitz

@markandsamafterwork 3 жыл бұрын

Hi John, I am not sure, at this stage I have seen very little on them, but Tacom HQ have been in touch and are in the process of getting one over here to test, so if all works out we should know more soon, FYI thank you very much for the support, sure helps, Cheers

@johnlebowitz6458 3 жыл бұрын

Looking forward to it

@markandsamafterwork 3 жыл бұрын

Cheers

@jjames5928 3 жыл бұрын

Great video , learned alot on this one .. you must be some type of engineer ?

@markandsamafterwork 3 жыл бұрын

Thanks Man, and mechanic/engineer so sort of, lol, Cheers

@jjames5928 3 жыл бұрын

@@markandsamafterwork awesome , I'm a Fuel tanker Driver and a Diesel Mechanic

@markandsamafterwork 3 жыл бұрын

@@jjames5928 Cheers

@philippefrater2000 3 жыл бұрын

Very Interesting as usual. Would you be able to make say a custom 222 Rem 24 inches long Heavy threaded barrel and ship it to France? (For my Browning A-Bolt 2 Composite Stalker action). I hope i'm clear enough. Thanks in advance! 🖖🏻🇫🇷😎🇫🇷😇🇫🇷🖖🏻

@markandsamafterwork 3 жыл бұрын

Thanks Philippe, even blank barrels have many shipping restrictions, chambered barrels have another level, best done in your country, or even better at your best local smith, Cheers

@philippefrater2000 3 жыл бұрын

MarkandSam AfterWork Thanks, i was pretty sure this was problematic... 👍🏻 🖖🏻🇫🇷😎🇫🇷😁🇫🇷🖖🏻

@markandsamafterwork 3 жыл бұрын

Cheers

@shermankearns200 3 жыл бұрын

I am posting the SAMMI SPEC PDF files website to download to your cellphone so that you allways have this critical information available to you. Here is the link enjoy 😉!! saami.org/technical-information/cartridge-chamber-drawings/

@markandsamafterwork 3 жыл бұрын

Thanks Sherman, Cheers