>>640295188" 1634 1458 1366 1366 1234 1145 1278 1180 1047 1329
18" 1754 1543 1449 1458 1297 1194 1370 1231 1083 1395
FPS +120 +85 +83 +92 +63 +49 +92 +51 +36 +66
Weight 90gr 115gr 125gr 115gr 115gr 135gr 105gr 124gr 147gr 124gr
They didn't go in order of lightest to heaviest projectile. Most all of the ammo tested is hollow points.
Which have more wind resistance, because they have a fuckin cavity in the tip of the projectile.
Hollow points are relevant and worth testing, but we also have no reference point for propellant load.
It is common sense that if you use hotter loads that you get better ballistics out of longer barrels. There is obviously
a limit to how long a barrel needs to be depending on the propellant load, and what kind of barrel it needs to be and
what kinds of pressures it needs to be able to stand up to.
Suffice it to say, this testing indicates that there is at most a 120 feet per second benefit to adding 10 inches of extra
barrel to build up pressure behind the projectile. Sorry, but that just doesn't make any sense and it would suggest that there
is no benefit to building rifles the way we do in the first place.
It is simple logic to understand that the difference between a 5.56 and a 9mm cartridge is projectile shape, size
and propellant load inside the cartridge. You tell me, what has more propellant, what has a hotter load? 5.56 or 9mm?
Obvious answer is 5.56 but 5.56 requires a completely different barrel that needs to stand up to completely different pressures.
So if you have a longer heavier duty barrel in a PCC it only makes sense that it can handle hotter loads compared to a handgun.
So if you're gonna use one you should use the highest marketed FPS cartridges, so long as your barrel is up to spec for those
pressures.