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12/11/2018 1:58:31 AM
11/9/2018 9:21:38 PM
Posted: 4/2/2018 11:58:11 AM EST
[Last Edit: 4/2/2018 12:02:22 PM EST by Stylz]
Link Posted: 4/3/2018 12:22:05 PM EST
Awesome video! Thanks for all the effort
Link Posted: 4/3/2018 1:41:05 PM EST
that would still hurt worse than a poke in the eye.....

thanks for the time and effort BF, always appreciated.
Link Posted: 4/3/2018 1:47:19 PM EST
Would it be possible to show side by side comparisons of the low and normal velocity gel shots? iirc, you've done normal velocity shots of Mk318, Mk319, and M855A1 right?
Link Posted: 4/4/2018 12:15:58 AM EST
Thank you for your Testing!

I just wounder if you can make a test to compare Ruag Action Styx and MEN QD , both in 5.56x45mm
Thank you!
Link Posted: 4/4/2018 8:59:03 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By mcantu:
Would it be possible to show side by side comparisons of the low and normal velocity gel shots? iirc, you've done normal velocity shots of Mk318, Mk319, and M855A1 right?
View Quote
Not Mk319.
Link Posted: 4/4/2018 9:20:36 AM EST
Link Posted: 4/4/2018 1:08:10 PM EST
Love your work.

I’m curious why you didn’t test it around 1900-2000 FPS. That is where a bunch of guys were developing loads with their pistol length bbls. I’d love to see some testing against soft armor, too.

Link Posted: 4/4/2018 1:18:11 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By 41magluva:
Love your work.

I'm curious why you didn't test it around 1900-2000 FPS. That is where a bunch of guys were developing loads with their pistol length bbls. I'd love to see some testing against soft armor, too.

View Quote
Cuz he's trying to find the lowest velocity it will still fragment at
Link Posted: 4/16/2018 6:50:35 PM EST
Very nice set up. Do you agree that the bullets very well may have yawed and tumbled??.
I did some testing in the late 90s and saw a lot of 308 168gr match kings yaw and tumble in gelatin shot at the 600yd range.
Velocitys and wound channel at this range were similar to your short range test..
By tumble I mean yawing and then going end over at about maybe 3/4 to one full turn before exit.
You can see this in very high speed camera footage in the old army tests of 556 and 308 FMJ back in the day.
Link Posted: 4/19/2018 9:52:53 AM EST
It would be nice to see the performance out of a rifle length barrel.
Link Posted: 4/22/2018 10:12:29 AM EST
[Last Edit: 4/22/2018 10:12:51 AM EST by bluefalcon]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Nichonator:
Very nice set up. Do you agree that the bullets very well may have yawed and tumbled??.
I did some testing in the late 90s and saw a lot of 308 168gr match kings yaw and tumble in gelatin shot at the 600yd range.
Velocitys and wound channel at this range were similar to your short range test..
By tumble I mean yawing and then going end over at about maybe 3/4 to one full turn before exit.
You can see this in very high speed camera footage in the old army tests of 556 and 308 FMJ back in the day.
View Quote
Reading gel without a recovered projectile is like reading tea leaves, but the track looked very similar to the Mk318 reduced velocity.
Link Posted: 4/26/2018 6:05:40 PM EST
Won't the 1-8 twist of the 300 BO barrel show different results than the 1-12 of the average 308 barrel ?
Link Posted: 4/28/2018 10:01:24 AM EST
"Yes and no" is a really shitty answer, but it actually kind of applies here. The 7.62x51 barrel has a higher muzzle velocity and slower twist rate. The 7.62x35mm has a slower MV and faster twist. While the rotational velocity might not be the same, there is less difference than there would be if they both had the same twist rate. That matters because forward velocity is reduced significantly with distance, but rotational velocity doesn't change much down range. Therefore, we get an even closer approximation to a down range result with a faster twist on the BO.
Link Posted: 5/6/2018 9:16:41 PM EST
I would really like to see both of these loaded in hot .30-06 loads to see how they react going faster than intended!
Link Posted: 5/30/2018 9:33:54 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Grinder:
Won't the 1-8 twist of the 300 BO barrel show different results than the 1-12 of the average 308 barrel ?
View Quote
Barrel twist rate has no practical effect on terminal ballistics.
Link Posted: 6/3/2018 2:53:48 PM EST
[Last Edit: 6/3/2018 2:54:14 PM EST by bluefalcon]
This is true, but the rotational velocity may be closer than it would appear at first glance. I don't know the math on it, but I think it should look like this:

1616 fps * 12 = 19392 inches per second ÷ 8 = 2424 rotations per second * 60 = 145440 rotations per minute
145,440 RPM

3050 fps * 12 = 36600 inches per second ÷ 12 = 3050 rotations per second * 60 = 183000 rotations per minute
183,000 RPM

So yes, the rotational velocity of the actual M80A1 out of the M240B is faster, but not as much faster as it would appear by looking at only the twist rate.
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