Ive always heard that out of a 10.5 most ammo will have an effective range of about 75 yards.
And I do have some TAP 55 gr HP bullets that Im using now.
Ive always heard that out of a 10.5 most ammo will have an effective range of about 75 yards.
And I do have some TAP 55 gr HP bullets that Im using now.
Last edited by Anonymous D; 10-28-2009 at 07:46 PM.
Originally Posted by Nermy2k
I'm sure that's true in some sense for some ammo. "Effective range" is a pretty vague term which can mean many different things. You could say that M193 from a 10.5" barrel has an effective range of zero (because it can't be relied on to fragment even at the muzzle) or you could say it has an effective range of a couple hundred yards (because that's the range at which a decent marksman could hit a human-sized target), and neither statement would be wrong, since they use totally different meanings of "effective range".
Fragmentation range is a much more concrete measurement than "effective range". Fragmentation range is the range at which the round drops below 2700 fps and thus will no longer fragment reliably in tissue (again, obviously this is only meaningful if you're using ammo that fragments in the first place, i.e. M193 or M855). Fragmentation range is around 150-250 meters for a 20" M16 barrel; around 50-100 meters for a 14.5" M4 barrel, and 0-50 meters for a 10.5" barrel (meaning it will sometimes, but not always, have a muzzle velocity above ~2700 fps). For even shorter barrels, like those silly 7.5" ones, it is unequivocally zero, meaning the round will NEVER have enough velocity to fragment even at the muzzle.
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