Rifle primers use more explosive than the pistol primers and can unseat bullets and/or cause higher pressures.
They will physically fit in the pocket but very different in their characteristics.
As with any changes in components you should drop your powder charge and work it back up while watching for any signs of excessive pressures. Hang fires and squib loads can be a consideration too. Be careful and stay safe.
Yes, but with any component change reduce load and do another work up. Small rifle primers use the same cups as small pistol magnum primers, thicker than standard primers and normally the same compound too. If you have a weaker firing system (lighter springs) then you may experience misfires. If your load is near max, you should reduce the load just as you would with small pistol magnum primers
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