Velocity & Terminal balistics [Archive] - Glock Talk

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RWBlue
05-15-2011, 22:25
My google foo is off. I use to have a link to a chart with velocity numbers for the different barrel lengths and then fragmentation ranges for the military ammo.

I am sure someone else has linked to it. Please post the link.

bullittmcqueen
05-16-2011, 05:02
I don't know about a chart but what you are wanting is on this page somewhere....

http://www.m4carbine.net/forumdisplay.php?f=91

RWBlue
05-16-2011, 09:29
I can not seem to find it.

Lets see if I can make the question simple.
At what velocity does yawing and fragmentation start to not happen?
What velocities should I expect from the different barrel lengths?



I am thinking about violating my standard rule when dealing with 5.56. I have always been a fan of 16" barrels or longer. I am thinking of doing a 14.5-14.7 NFA.... I know I am giving up velocity for compactness and it is only 2 inches, but.....

Gunnut 45/454
05-16-2011, 10:01
RWBlue
Bullet wt/contruction play a big roll. General rule of thumb is 2100-2300 fps depending on bullet type/wt. So your shorty barrel gun can loose it effectiveness in as little as 75 yards if you use 75gr bullet! Where as a 55gr bullet may get you out to 175-200 yards!:supergrin:

RWBlue
05-16-2011, 10:59
RWBlue
Bullet wt/contruction play a big roll. General rule of thumb is 2100-2300 fps depending on bullet type/wt. So your shorty barrel gun can loose it effectiveness in as little as 75 yards if you use 75gr bullet! Where as a 55gr bullet may get you out to 175-200 yards!:supergrin:

I will agree about bullet construction. I have seem FMJ (non-M193, but sold as M193) where the jacket remained intact and the lead was squeezed out.

Real M193 and M855 fragmenting as expected at 100 yards. And Hornady and Sierra handloaded 75-77gr bullets totally fragement in gel. It is beautiful stuff when it works and not so much when it doesn't.


But what I am thinking about with this project is mainly standard issue M855 and M193. This should be well documented in military testing. I swear I have seen a chart.

Then varmint rounds for indoors where pen is an issue and a handload 70gr Spear for medium to large game animals if needed. These are not going to be documented well.

Fabius
05-22-2011, 07:45
Is this the chart you're looking for?

http://forums.second-amendment.org/index.php?topic=636.0

My recollection, confirmed by the chart, is that M855 drops below fragmentation velocity at around 95 yards, and M193 at around 125 yards.

RWBlue
05-22-2011, 11:26
Is this the chart you're looking for?

http://forums.second-amendment.org/index.php?topic=636.0

My recollection, confirmed by the chart, is that M855 drops below fragmentation velocity at around 95 yards, and M193 at around 125 yards.

That will work.

I would love to see some other bullet/cartridge comparisons, but this is a great start.