Sig P320 Carry and 9mm Ammo

[philadelphia patriot]

I bought a Sig P320 carry in 9mm and love it. If you watch hickok45 and fxhummel's YouTube videos on the p320 then you would understand why I love the firearm. Anyways, so far I have shot 115 grain FMJs and 124 grain +p HPs (specifically HSTs) through it. I find my groups are cut in half when I use the 124 grain +p rounds. Does anyone else have any similar experience with 124 grains vs 115 grain?

When I do my next bulk ammo purchase I am going to specifically buy 124 grain (no +p) FMJs.

[RockIsland]

I have a Star M43 that does the same thing. Maybe it's because of higher velocity in the shorter barrel? I don't really get it either, but it's a tack driver with 124gr+P, not so much with 115.

I almost exclusively use 124gr in all my nines.

[Mustang GT500]

That's strange considering the velocity of the 124gr +p would be slightly higher than the standard pressure 115 FMJ and should have a tad more muzzle flip. It's probably nothing.

[jthrelf]

Besides the bullet weights (and I do prefer 124gr) don't forget that the HST is a higher quaility round loaded more consistently than typical 115gr target ammo. It is good that you found a load that does well with your pistol.