I am just starting to reload 9mm. I was able to pick up some Remington 5 1/2 primers thinking because they said "small pistol" on the box that they should work for 9mm. After reading a bit more, I'm hearing that Remington 5 1/2 are actually small pistol magnum primers. Could these still be used for 9mm loads? What about something like .357 Sig, since I will want to start reloading that in the future? Thanks for helping the new guy!