According to an NRA publication I have, the correct groove diameter for a .30 Luger is .310". Thus .308" & .309" bullets work well. I used to run .312" bullets through a .310" sizing die and they worked great.
The 100 grain .308" Speer "Plinker" bullet, a half jacketed design, works well IF you can get the correct neck tension to prevent setback of the bullets under recoil. They are also cheaper than the other available pistol bullets which, IMO, are overpriced.
In order to get the proper neck tension with the Plinker bullet, I bought a tool that impresses a cannelure on the half jacket and allows a roll crimp to be used. It takes a little time but it works.
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