pistol primers are softer than rifle primers and to the most part have less energy.
Remington 6 1/2 primers are some of the softest and lowest energy small rifle primers, I believe.
If you use rifle primers in a pistol cartridge there are a couple of things to keep in mind.
You probably should lower your maximum load as pressure will likely be higher.
t seems to me that I loaded some pistol ammo with rifle primers, many years ago and the rifle primers were dimensionally deeper than pistol primers - but that is a hazy memory. Quite frankly I do not remember if it was small rifle primers in a 357 or large rifle primers in a 44 Magnum. But I think it was likely the 357 as that was my first pistol - a Herters Model perfect that I mail ordered and got it shipped to the door, no FFL was needed.
The question was Small Magnum Pistol primers,not std small pistol primers
