You don't need CCI #34's for any semi-auto. They're a marketing gimmick for magnum primers. Regular large rifle primers will be fine. Full length resizing(every time), seating the primers properly and watching the case lengths is required.
Slamfires are caused by improperly seated primers, not the rifle. In any case, you'll have to work up a load for each rifle. No two will shoot the same ammo the same way.