[dunerjeff]

You said Beretta?? Your barrel IS .357 to .358, I will garrantee that!!!
I have slugged 9 of them and know a number of others that have done theirs. They are all big. You will need .358 sized bullet to get proper fit. I have several molds now and all issues I've had in the past are gone.
Remember when shooting lead FIT IS KING.
Take a lead sinker and shave it through your barrel, then measure the od with a micrometer, not calipers, you will see what I'm talking about. Then get Missouri's 140gr "ZINGERS" ,sized .358,and enjoy.They were the best shooting in all my 92's. I even bought a Magma mold to make my own.
You can also do what I did to several of mine.It makes them shoot as good as they get.