Stay away from vital Shok , used it for years and last year had a few problems. Inconsistant loads in a few boxes. A lot of pressure. Made the bolt in my Winchester Model 70 30 06 extremely hard to open, and also would not eject from my nephews remington semi. Fire it and the slide was jammed forward had to put a rod down the barel and bang on ot to nock the bolt open. Then a friend brought his Remington model 788 308 to me with the bolt stuck. It was more Vital Shock. Then was at the range one day, and a guy with a remington semi fired a shot and the second live round jammed the bolt . All guns function perfect with Hornady or Remington and Winchester ammo.