This is .327 Federal Heavy Buffalo Bore 100gr. Jacketed Hollow Point Ammo. Buffalo Bore 37A is a Full Power 327 Federal load and utilizes a flash suppressed powder, so the shooter will not be blinded by his own gunfire should the hammer be dropped in a low light situation. This ammo is brass cased, boxer primed and non-corrosive. This ammo is packed in 20rd. boxes.