I have now fired 100 rounds of Federal Hydra-Shok through my P220. I fire of my carry ammo after about six months and replace it with new production ammo. The reason I buy SIG Sauer pistols is so I don't have to wait until I have 200 rounds of a particular cartridge fired through the gun to know if it will work. The only other brand of handgun that has given me that kind of reliability has been Glock.