I’m nearly 80 been reloading since 69 and regularly do load development and testing in a very wide range of calibers in custom rifles and this is the most informative and valuable source of relevant information I’ve ever been exposed to. This is a must listen too for every handloader . I can’t wait for the next.

This is the kind of information handloaders really appreciate. I'm just in the beginning phase. This is terrific information!!! So much that I am honestly going to re-see this video a couple more times, it takes me a few go arounds to let it all absorb. Great job explaining what is happening during those few microseconds from trigger pull to bang. Great job by all you guys, you obviously know you field of expertise very well, Hornady is lucky to have you all working there. Thanks again all for a great, informative video.

I've been a reloader for 25 years. Good show folks. It was educational! I picked up new information that changed a couple of pre-concieved notions I had. Thank you!

Very good format. I am from Germany , reload my bullets with a Hornady LnL I ve learnt a lot.

Seriously one of the best podcasts I’ve listened to. I love learning about the technical details of how this stuff works. Thanks guys.

The bore diameter point was phenomenal

Really enjoyed this discussion, when you mentioned energy density it helped line up a few things I have been confused about for a while. thank you

Very educational. The part at the end about monitoring velocity instead of pressure signs was very helpful. I'm new to reloading, but my velocities are higher than the published values. I trickle-up every load and verify my balance beam scale setting with a digital scale. 6.5 Creedmoor, 140 ELD-Match, 41.1 grains of IMR 4350 should produce 2700 ft/sec. Yet I'm measuring 2740-2760 ft/sec with my MagnetoSpeed in 80F weather. Ashbury Precision Savage 10 with a 24" barrel. My seating depth with the 140 ELD-M results in a COAL of 2.824" -- 0.024" longer than the COAL of factory ammo. P.S. I finally scored some H4350, so my next visit to the range will be using 41.0 to 41.5 grains of H4350.

I'm watching this like a week now.. 10 minutes Monday, 5 minutes on the afternoon, non on Tuesday and so on and so on... I'm finally through with it... Thank you for your time guy's. :)

I’m still new to shooting and reloading. I have to say gentlemen this is a honest and bold podcast. I have to respect you for that. However, I just want to understand how to reload my new rifle. You have turned everything I’ve tried to learn on its head and I feel sick. Interest times and thank you so much. I’ll keep trying to understand what best to do and how to do it. The shooting and reloading community is an amazing place.

Great info all the way through, but the last 12 minutes or so are GOLDEN!

W O W !!! Thank you so much for doing this podcast! I have been reloading for more than 40 years, and I still picked up several bits that I didn't know. And I found several explanations for things I have had happen, but I didn't know the reasons for it. I am looking forward to your next podcast.

This is some of the best info Ive heard yet. Thank you and hoping for more!

Good information for sure. Reloading for an Elk hunt, 300 WinMag, and can better understand the overall cartridge setup and powder selection.

This is great content! Easily understood explanations of aspects I haven't thought about before.

After reloading for 40 years, this is the most educational video I've watched. It does explain many of the traits I've seen but couldn't determine the cause. Keep the videos coming our way! Thanks.

Great discussion. Tools like GRT have enabled big leaps in helping with powder choices and understanding internal ballistics. In general terms, I like to have a case full for 100% burn ratio. All my best performing loads are case full or slightly compressed. I think you get more uniform ignition and lower SDs this way. There are some odd pairings too that just work really well like N140 in 308 with heavies like 190 smks and the same powder behind 35 bergers in 204 makes for modest velocities in mid 3000’s but great accuracy. I’ll be paying extra attention for pressure signs and testing all my mv’s from now on as I had no idea ejector marks = 70kpsi + !!😮

That's ALOT of good info. Can't wait until the external ballistic episode.

Loved this conversation/education. I wish a bullet could be stopped untouched right after leaving the barrel by a magnetic field to see and measure if cup and cores deform any different than monothilics like copper. You can do it Hornady!

Great stuff and points well taken. So awesome to continue learning in this ever changing world!

Thanks for having the podcast. These are great! Thank you!

Darned, this was a great video. This is one of those “hit the back button and listen to parts of it again and again to make sure I understand type”. The talk about pressure and volume and kind of remind me of like a surfboard and a wave were that surfboard is far ahead of the wave or backup against the wave and the steeper the slope the more pressure

Thanks. I wish you guys produced these videos a year ago.

Great discussion. Lots of good info.

Great job guys. I would have loved to get a 300 PRC. But the lack of inventory held me back. I believe it's my dream cartridge. I was pissed about free bore topic, thinking you guys skipping length of free bore on purpose. But great info. Thanks

Absolutely fantastic. Validates what i have seen in I dont know how long, 40 years of reloading. Down loading some Saami specs now too. I just want to fine a little more on bullet searing depth or more specifically ogive to lands distance. . Thank you guys for finally erasing so much of these dangerous myths out there. Now if i can just gget

Really very interesting and extremely educational. And brought in a very nice way. Thanks a lot!!

Please do an episode about rifling. 1) Relative width of lands and grooves. 2) Square lands and grooves vs. metford type rifling vs. polygonal. 3) Depth of rifling. eg. 30 calibre with .308 or .311 projectiles. 4) Can blow-past ever be useful or desirable?

The advice at the end is all fine and well when there is published SAAMI spec data to go on, but when you're dealing with a wildcat cartridge its right back to trying to interpret the tea leaves of pressure signs.

Good education, great work guys

Thank you for making this podcast series available. I recently found it lots of great information I really enjoy listening to them. I downloaded the 4 DOF app. After just looking through it quickly it's awesome can't wait to try it out. Thank you and keep up the great work.

Great discussion, guys. I always learn things from your podcasts.

I struggled with Physics in college, but I do remember the this one rule; "For every reaction, there is a equal and opposite reaction" The primer falls under this rule.

Great chat fella’s 👍

Hi Seth, I’ve been watching you here and just saw you on Backfire podcast. I like your stuff so far. I really liked your interview with Jim. Jim’s popular (in my opinion) because of his personality as are the Vortex guys. You have to lighten things up a bit and talk about personal experiences and get your guests to do the same. I wish you success with the podcast and keep up the great work.

Great point on velocity correlates with pressure. If your velocity is high, so is your pressure.

Great job 👏🏻

I was shooting benchrest about 20 years ago in the 100/200 yard nationals and I had a 6 PPC case that didn't have any powder in it. When I pulled the trigger it just clicked so I pulled out the empty case, confused. There was a whisp of smoke present and no bullet in the case. I thought I hadn't removed the last shot so I tried to put in another round, but it wouldn't even begin to chamber because the bullet had been driven into the rifling by the primer on the empty case. Had to tap it out with a cleaning rod, which didn't take much effort, but what an embarrassment and a concentration breaker.

Loved it

One topic I would like to hear about is the effect on pressure/resistance/fouling or other issues from having a more aggressive twist rate than standard, same question also for the external ballistics video, what are the negatives of a higher twist rate... thanx

Excellent. You guys should start a service measuring pressure for common cartridges. I have a few handloads I'd like tested...

More great information thanks

Best discussion of this topic I have ever seen. You didn’t get into the chemistry or thermodynamics of hot reacting gasses. I probably wouldn’t understand the chemistry anyway…. You mentioned reloaders not having a pressure testing device. Many years ago I bought a strain gage setup which I used briefly. I thought I should glue the strain gage over the chamber but the closest I could get it after the threaded portion of the barrel was just past the receiver. From what you said I must have been near the maximum pressure location after all. I never thought I was getting a reliable absolute pressure reading but I could compare my reloads to a factory cartridge. The factory loads that had a sharper recoil did give higher readings so my gages set up seemed valid. I could see the primer pressure and then the main charge ignite. Which I still don’t understand due to the location of my strain gage. I am now reloading 6.5X47 Lapua in. 30” barrel. I have been using H4350 with good results and about the expected velocity. I tried Vithavouri’s maximum recommended load of VVN 540 and got even better velocity and great accuracy. Unfortunately, I am out of VVN540 and can’t find it for sale anywhere. I never go over (depending on which manual) the recommended load. My custom gun doesn’t show pressure signs from inspecting the fired cartridge at the loads I am using but from your discussion I now understate a gun like mine won’t show pressure signs as soon as I might expect from a factory rifle.

Great video. I have always had a concern about firing a. 380 ACP in a 9mm, or a .40cal in a 10mm. I've never done either, but I am far less likely to ever try it, unless I were ridiculously desperate.

Been looking for this one forever. Don't know why it took this long to show up on my feed.

The SAAMI chamber for the 300 Win Mag has no freebore. It just has a funnel that starts at .315" dia. That is what is used in almost all factory guns. As Seth noted, there are a lot of custom reamers that add a tight freebore section, but they are mainly found on custom barrels. The big advantage of the new cartridges like 300 PRC is that they have the more advanced chambers from the factory. FWIW, the 7mm Rem Mag does have a chamber with.section of relatively tight freebore, so it tends to be more accurate.

Great video. Have you guys done much pressure testing with store bought superformance in .308? I was told by Hornady this combo would not work. I have no way to test what actual pressure is but with 35 years of reloading and some carful experimenting I came up with a load that works well for my application. 28” barrel. 175 gr Nosler RDF, federal 210m primers, 49.8 gr powder with lapua brass.

Would love to see them do detailed discussions of observed pressures and velocities with a 264 win mag.

Handlebar’s mic is a little hot. I was kinda hoping for a bit more technical info. Maybe that’s too much to ask with proprietary R&D and guarded trade secrets. This was fairly elementary.

How do straight wall cartridges get affected by all this knowledge you're passing on. And thank you for an awesome effort on communicating what's involved in these reloading bullets velocity etc great job guys

I'd assume that as the barrel gets hot and increases in diameter, the pressure within the shot cycle must drop... not a lot of expansion at ~6.5x10^-6/°F, but it must make a difference. Is this ever a concern, I wonder?

I am know the barrel pressure drops when the bullet passes the gas hole in a "gas" gun but what effect does this have in the bullet and speed?

I am thinking the bullet moves and hits the rifling but the bullet is still in the case. The case has already expanded as far as the chamber allows. The internal case neck diameter during total expansion is larger or smaller to the diameter freebore? Perfectly the same sounds best to eliminate changing pressure and decrease movement.

Could you address the internal ballistic effects of the shape of the rear of the bullet? Boattail, flat base, rebate. As the pressure pushes on those different angles, what is the effect on obturation, concentricity in free bore, etc? What effect would a series of rebates have?

How do you measure these pressures? Do you drill a hole in to the free bore section of the barrel? But then you'd only get readings after the bullet has fully left the mouth of the case. Do you also drill a hole into the chamber and through the brass case into the volume where the propellant/powder is?

You mentioned pressure signs on a gas gun having to do with timing. PLEASE do an episode on that. I'm running a 16.5" 308/AR with a Trash Panda. Still having issues even after putting the h3 buffer and turning the gas down.

I understand what you are saying about Lawyer Loads but could you please provide a brief commentary on why I can look up a load in the Hornady book and the same load on the Hodgdon site and the max loads are materials different

Expected more discussion about dynamically controlling burn-rates? 1) If the ideal is uniform acceleration through barrel-length, then ideal burn-rate increases as time-squared? Yet powders are uniform? Raising questions about burn-patterns both within the cartridge and in the barrel? 2) Likewise, twist-rate of barrel lands/grooves? Lands/grooves can be seen as exerting forces on the bullet (from the bullet's perspective), with linear lands/grooves exerting more-and-more force toward the exit-end of the barrel? Wouldn't accuracy be increased with higher twist at the breach-end and less twist at the muzzle-end (to achieve constant angular-force across barrel-length?)?

I like hornady ammo for my 6.5 grendel. And i buy hornady shirts.

Great bullets ....

Is there anything as helpfull as Propellant Profiles , thats out of print , out there detailing powder particularities ?? This was great info thats no longer available anywhere that i can find .

Great info! Curious what effects seating depth has on the pressure inside the case or chamber. If anything

May I ask about the background of the gentlemen in the discussion. I'm a mechanical engineer and am curious. Cartridges are so complex. I can see a need for an understanding of aeronautical, chemical and mechanical engineering. Ty gentlemen and Ty Hornady for sponsoring these excellent videos.

How does rifling work? What effect do muzzle devices have?

Hopefully yall see this. I want a 7PRC for hunting big things but I want a short barrel like 18”-20” with a can. Good idea or stick to 20+” on the 7prc. Also that was an awesome episode

I would love to hear about some of the higher level internal balistics. If that isn't something that you are able to do is there any chance you could give some references for someone who wants to learn more about internal balistics. I have questions about why we don't have Sabots commonly available. They seem to offer so much. A cartridge could easily be straight walled while shooting small diameter bullet possibly at ultra high speed. It seems ideal to get the speed for monolithic bullets. I am a knife maker and am aware of many of the advances in steel. Especially with the entrance of the .277 Fury running at higher pressure it seems like we could have a jump in firearms technology. I like what you guys have done with extrenal work along with your high speed stuff, and I think it would tie in well with a jump of energy density. It seems that it more wear resistant steels were used at least during the first part of the barrel to cut down on throut erosion. Are there any options coming up.

300 wm is hard to shoot accurately? Interesting because it has been used for long range and military sniper use pretty much since it came out. Yes, the free bore diameter is bigger than the 300 prc but it's not hard to shoot accurately. 1/2 moa is very doable with a quality factory rifle and ammo

Does crimping make a measurable difference on pressure/velocity?

Short fat cartridge vs long skinny cartridge (all else equal, powder charge, bullet weight). Barrel length effect on speed? I am convinced the short fat cartridge needs less barrel length for same speed, or is less affected by barrel length.

Great information gentleman. I have a question, what happens if you are getting early pressure where you are getting ejector marks, slight bolt lift, but low velocities? I have a 6.5 prc with a 22in barrel but getting 100-150fps less than expected? Can tight neck tension cause early pressure signs with lower velocity?

Speaking of lawyer loads. Your 308 load data is significantly less than everyone else. So can you explain why different manufacturers are providing significantly different data? It be one thing if it's half grain here or there. But we are talking 2-3 grains difference

I wish someone would come up with a reloading book strictly for semi-auto gas guns with shorter barrels than bolt guns

What is the concept of gliding metals?

When reloading for accuracy (i.e. 6.5 Creedmoor) should the bullet (Ojib) be against the free bore lands, or allowed to slam in to them❓

Where do you find max velocity for a 6mm creedmoor? Saami only has a 108 listed at 3050 I think. Where would I find max velocity for a 105 so I can find my max load

So if I get it right, that's why military ammo have crimped primers? Cause of loose chambers?

Why coated bullets?

👍

Love the technical discussions on the podcast please keep these going. I do have a question in your 11th edition published load for 308 Win. 176-180 gr weight bullets for Varget shows max charge of 42.4gr. yet Hodgdon who makes Varget shows a max charge of 45.0gr. why is this? The first instinct is environmental conditions, however knowing that Varget is a temperature stable powder leaves me a bit baffled.

Make cheaper 6.5 creedmoor ammo

Not saying that 300 winchester is better nor am I saying 300 prc is better. BUT! atleast I can reload my 300 winchester brass without having to RE-REAM MY BARREL with a CUSTOM REAMER so that my brass doesn't start giving me STICKY EXTRACTION DUE TO TOO TIGHT OF A CHAMBER REAMER DESIGN BY HORNADY!!! HORNADY!!!!!!

Thank you Hornady for putting together this podcast. I really enjoy this type of information thank you so much this is stuff I wish I would have known years ago. Thank you guys I can't wait for the video on external ballistics