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JEVapa

JEVapa

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I kept this here vs reloading. I don’t reload to reinvent the wheel. I reload to match existing known cartridges that are proven. I look at a bottle of H4350 and ask myself, “self, how many rounds of Berger 140 hybrid match ammo can you make with that there bottle?”
I’m not into wasting time, components, and equipment wear chasing vapor. That kind of cha-ching adds up. If it was a hobby then I’d probably think differently.
Ladder tests I do are to confirm they match as closely as possible to existing rounds I know perform. Then that single recipe gets written down and that’s all I load for that cartridge.

 
what is a the TKO for the 6.5 cm at 800?
I remember reading about a year ago where the military was changing over to 6.8x51. When they say military does that mean all as a whole or just specific branch’s?
 
I don't really pay attention to TKO. I think it's a made up formula that's kind of widgety. I look at energy when I do my ballistic table. In the past some gov lab guy with a BGH determined that 250-350ish ftlbs will kill a human pretty much dead so we would always use that as a guideline. At 800m with the standard data, 175gr GMM/AB39/M118LR has 683 ftlbs of energy while the 140gr SOF ammo (140gr Berger Hybrid) with standard data has 809 ftlbs of energy. Bullet diameter and all that extra mumbo jumbo means nothing except in the flight ballistics. So a 140gr Berger Hybrid will kill something a little more dead than the 308 SMK it's replacing and it's way more accurate for a much longer range. Now, shorter barrels, environmentals, etc that reduces velocity will change those numbers but the .264 140gr will always outperform the 175grSMK as long as it's going at the speed it needs to.

WRT to the 6.8x51, that's what the regular Army is going to for "front line" soldiers. It's not a regular 6.8. It 80K PSI and going 3000FPS out of a 16" barrel. My buddy described it as shooting "a bag full of dildos falling off a truck". I guess it's about as accurate as a bowling ball too. They all love the machinegun though. The M4/M16 isn't going anywhere anytime soon.

The 140gr 6.5CM Bryan is talking about is for USSOCOM for the DMR and Sniper gas guns.

None of this is professional or medical advice, only my opinion.
 
JEVapa said:
I don't really pay attention to TKO. I think it's a made up formula that's kind of widgety. I look at energy when I do my ballistic table. In the past some gov lab guy with a BGH determined that 250-350ish ftlbs will kill a human pretty much dead so we would always use that as a guideline. At 800m with the standard data, 175gr GMM/AB39/M118LR has 683 ftlbs of energy while the 140gr SOF ammo (140gr Berger Hybrid) with standard data has 809 ftlbs of energy. Bullet diameter and all that extra mumbo jumbo means nothing except in the flight ballistics. So a 140gr Berger Hybrid will kill something a little more dead than the 308 SMK it's replacing and it's way more accurate for a much longer range. Now, shorter barrels, environmentals, etc that reduces velocity will change those numbers but the .264 140gr will always outperform the 175grSMK as long as it's going at the speed it needs to.

WRT to the 6.8x51, that's what the regular Army is going to for "front line" soldiers. It's not a regular 6.8. It 80K PSI and going 3000FPS out of a 16" barrel. My buddy described it as shooting "a bag full of dildos falling off a truck". I guess it's about as accurate as a bowling ball too. They all love the machinegun though. The M4/M16 isn't going anywhere anytime soon.

The 140gr 6.5CM Bryan is talking about is for USSOCOM for the DMR and Sniper gas guns.

None of this is professional or medical advice, only my opinion.
Click to expand...
6.8x51, That what Sig is calling the .277 Fury?
 
Yes. The 6.8 ammo for civilians isn’t 80k psi and 3000fps at 16” either. It’s way reduced, like a normal round and a different projectile.
 
I looked into it when I was researching the 6.8 Western. Not crazy about sending that much pew through a hunting rifle with no return on brass.
 
JEVapa said:
I don't really pay attention to TKO. I think it's a made up formula that's kind of widgety. I look at energy when I do my ballistic table. In the past some gov lab guy with a BGH determined that 250-350ish ftlbs will kill a human pretty much dead so we would always use that as a guideline. At 800m with the standard data, 175gr GMM/AB39/M118LR has 683 ftlbs of energy while the 140gr SOF ammo (140gr Berger Hybrid) with standard data has 809 ftlbs of energy. Bullet diameter and all that extra mumbo jumbo means nothing except in the flight ballistics. So a 140gr Berger Hybrid will kill something a little more dead than the 308 SMK it's replacing and it's way more accurate for a much longer range. Now, shorter barrels, environmentals, etc that reduces velocity will change those numbers but the .264 140gr will always outperform the 175grSMK as long as it's going at the speed it needs to.

WRT to the 6.8x51, that's what the regular Army is going to for "front line" soldiers. It's not a regular 6.8. It 80K PSI and going 3000FPS out of a 16" barrel. My buddy described it as shooting "a bag full of dildos falling off a truck". I guess it's about as accurate as a bowling ball too. They all love the machinegun though. The M4/M16 isn't going anywhere anytime soon.

The 140gr 6.5CM Bryan is talking about is for USSOCOM for the DMR and Sniper gas guns.

None of this is professional or medical advice, only my opinion.
Click to expand...
Makes sense. I was looking at my ballistic calc for the 6.5 and 308, makes more sense they use a different ammo. Not sure why I didn’t think about that. I may just switch my 308 to the 6.5 barrel i have…
The 6.8 i did notice civilians have a different version. Was your buddy not referring to how bad the accuracy is? I’ve been wanting to play with one.
 
Beautiful Mulberry said:
Was your buddy not referring to how bad the accuracy is? I’ve been wanting to play with one.
Click to expand...
Accuracy and recoil. It's a 9+lb rifle that beats the shit out of the users. It's like they went back in time to get a giant rifle and the Army's been lugging around a lightweight carbine for 20 years and now they have a man rifle that weighs a ton with ammo that weighs a ton.
 
This seemed appropriate since we were talking twist in another thread. Who knows what a bullet does when it goes trans and begins to lose gyroscopic stability? Who thinks it tumbles? Who thinks it flies everywhere looking like an Atom symbol?

 
JEVapa said:
This seemed appropriate since we were talking twist in another thread. Who knows what a bullet does when it goes trans and begins to lose gyroscopic stability? Who thinks it tumbles? Who thinks it flies everywhere looking like an Atom symbol?

Click to expand...

Does he have more on this topic? If so where can i find it?
He explains things in a simple way that I understand
 
You can get his books, or follow him on instagram.

From your post in the NV thread:
“With the 1/8 what’s the heaviest bullet you run?
What velocity and distance are you getting?
What group size do y’all average?”

I just use 175 GMM. Velocity is the same and groups are still under a min, but what you get is range and accuracy from the stability gained for the tighter twist.
 
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