For me to be comfortable carrying a new gun, it needs to shoot at least 200 rounds of the same JHP defensive ammo that I’ll carry when CCW’ing without a single stoppage. Ordinarily, I’ll put at least 500 rounds of practice ammunition through the gun first… mostly so as not to waste the more expensive JHP ammo on a gun that might be having a problem. If the gun cannot make it through that 500rd of FMJ-style ammunition, I’ll examine it and attempt to fix anything either by working on it myself or returning the gun to the manufacturer. Then I’ll start the cycle over again, 500rd of FMJ followed by 200rd of JHP, minimum.