There is a possibility your gun may shoot the .358 just fine. The trick is making sure you aren't trying bullets undersized- that'll lead your barrel for sure.
Clean your barrel until you get every bit of jacketing material out of the barrel. Jacketing will lead your barrel since the lead sticks to it.
One thing you should do is push a pure lead slug thruogh the barrel which will tell you exactly the bore size. Use fishing sinkers for this. Make sure the sinker is bigger than your bore.
You may have to match the bullet to the size of your chamber. I have a 9mm sig that will not accept a case with more than 356 bullets. I have others that'll handle .358 bullets with no problem.
I have a Brit Enfield that has a freakishly large bore at .318. .308 to .311 will not shoot. The chamber lets me shoot 8mm cast bullets at .323 with ease to astounding results.
I've shot wheel wieghts through every centerfire gun I own. It's fun to experiment. You can get accuracy like you'd get with a jacketed bullet if you are willing to experiment. I can get full jacketed speed loads when I paper patch my cast bullets.
I use Lee sizers which cost around $12 to $14 on the web so the cost isn't too outrageous.
Here is the place for cast bullet info. There is more info here than you'll read in a lifetime.
http://castboolits.gunloads.com/index.php
If you are seriously thinking about it Midsouth shooters supply and Natchez has the latest Lyman cast bullet manual for $20.00. I'd seriously consider it since it is the most read gun book I own.
TED
