Buffalo Bore loads their ammunition with the highest quality components available to maximize the performance of the ammunition. This ammunition is safe to use in all 357 Magnum chambered firearms that are in proper working condition. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases. Owner of Buffalo Bore Tim Sundles on Buffalo Bore Heavy 357 Magnum Ammunition:For those wanting the deep-for-weight penetration of the all copper (lead free) Barnes XPB 125gr. bullet in a ?tactical? loading, here it is. We use low flash powder so the shooter will not be blinded by his own gunfire, as nearly all self defense shootings in America occur in low light when the criminal element is out and about. Our tactical 357 mag. ammo generates less felt recoil and blast (flash and noise) than our Heavy 357 mag. loads and as such is a better choice for those carrying light weight short barreled revolvers. This is still a full powered 357 mag. load, but allows for f...