re: Question for Bapple about reloading:

Rifle primers (Small Rifle primers) are for rifles. Small pistol primers are for pistols. I don't have the specs, but I'm sure the pocket sizes are different on the cases not to mention several other parameters.

Powder is different.There is round/ball, stick, and other types of powder. Get a reloading guide and you'll see the difference between 9mm and .223. By the way...good luck on finding primers and brass for two calibers.

Burn rates on powder is different...pressures are different...wrong powder...bad pressure...could result in a split brass or worse.