I loaded some 38's and 357's before noticing the 357's require a mag primer. Do not have any, store have none and I do not care enough to pay for mail order. I'm only doing a couple hundred. BUT, a few 357's failed to fire in double action. Lotsa reasons possible for that, but I was wondering if I might sub small rifle for the small pistol mag with acceptable results. Anybody do that? Opinions? Thanks