I use federal 215 mag primers in all my rifles that accept large size primer. After much “personal” review And shooting, I found these to be most consistent. Magnum primers have a greater amount of material so burn is stronger and longer. This doesn’t necessarily equate to huge jumps in velocity or pressure, the amount of powder is ruling that action. All powders react differently so do your own study. On the other hand, large rifle and large rifle primers are not necessarily interchangeable. The cup is thicker on rifle and can protrude out of pistol, or pistol primer can seat to deep in rifle cartridge. Both situations are not conducive to consistent shooting.