I'd like to make a 147 grain load similar to defensive ammo. When I look at all the Federal and Gold Dot defensive ammos, the power factor ranges from 139-147. So I figured I'd make a reload with 147 grain ammo with a PF around 145-147 to train with, and then purposely buy 147 grain defensive ammo for the real deal.
My question is, Sig has a 9MM, 115GR, ELITE V-CROWN, 365 JHP which is a 115 grain JMP with a velocity of 1050 and a PF of 121. I understand why Sig might want to make a defensive round with a lower felt recoil since the SIg P365 (my defensive handgun), is a very small light handgun, but how do I reconcile the idea that all the other 9mm defensive ammo has a PF of around 141-147 and this singular advertised defensive round for the Sig P365 has a PF of 121?
Is it possible that the velocity of 1050 is indeed measure in a 3.1 in barrel of the Sig P365 instead of the other defensive rounds which are typically measured in a 4in barrel?