I may be wrong but I understand that rifle primers are harder than pistol and may not fire in a pistol or may need to be struck more than once to fire.In austin, McBrides gunshop had no primers except for 3 boxes(100ct) of shot shell primers. They were also cleaned out of projectiles in 223 and 7.62x39 except for a couple of 100 ct boxes. I talked to the guy behind the counter about using small rifle primers in small pistol loads. He said that back in the day,several magnum and other high-powered calibers actually called for them in a few reloading books. I'm tempted to batch out a few for my 9mm and test that theory.
I may be wrong but I understand that rifle primers are harder than pistol and may not fire in a pistol or may need to be struck more than once to fire.
The guy said the cups may be harder but said any stock hammer spring would still set them off, no problem. He thought the bigger issue was the seating depth and claimed rifle primer cups were more shallow than pistol ones and would potentially seat too deep increasing the chances of a misfire. Don't know if that is fact or fiction so I may measure some out today with a caliper and find out.