twofewscrews
Member
I own a Ruger PC9 and was considering purchasing/stocking up on some HP ammo for self defense/hunting/SHTF. After a bit of research, in particular the LuckyGunner article titled Self-Defense Ammo for Pistol Caliber Carbines as well as Paul Harrell's Youtube video titled Ammo Selection for 9mm Carbines, I settled on some flavor of 147 grain HP ammunition for use in my PC9. This was due to the fact, at least as far as the information I could find, that when a 9mm 115 grain or 124 grain HP is sped up it loses effectiveness. The increase in speed leads to uncontrolled expansion or fragmentation of the bullet. The 147 grain HPs did not see the same velocity gain from a 16" barrel thus it's performance was not affected.
This made me wonder, does speeding up a 9mm FMJ 115 grain, 124 grain, or 147 grain bullet cause them to lose effectiveness/act in a way they were not intended to act?
Do FMJs flatten or fragment like HPs when pushed past the velocities they were designed to operate at?
This made me wonder, does speeding up a 9mm FMJ 115 grain, 124 grain, or 147 grain bullet cause them to lose effectiveness/act in a way they were not intended to act?
Do FMJs flatten or fragment like HPs when pushed past the velocities they were designed to operate at?