5.56 short barrels and effectiveness.

[Chuck]

My search-fu is weak.
I'm sure this has been covered.

I'm looking for info on reduced wounding capacity with various ammo at various ranges.

Thanks in advance!

[ack495]

Have you read this yet:

https://www.m4carbine.net/showthread.php?t=19881

Pretty much all you need to know

[TehLlama]

You just start with less velocity, so distance before the bullet stops reliably performing will drop accordingly: but which powder/bullet weight combinations are most/least affected by shortening barrels is the only thing outside a velocity chart that would need to be taken into consideration.
For apples to apples (like projectiles, like targets), velocity is the only relevant input.
At a given velocity (and corresponding energy), the wounding should be identical - that velocity will be that much closer from an SBR than a 24" rifle. You just start farther along the velocity chart if you don't care to muck about with BC's, and relate those corresponding speeds to the terminal ballistics information.