thanks for all the info, sorry for not including the throat diameter.

I measured .428 by running one of my cast bullets through the throat. There was some rebound since I still can't easily push the bullet through the throat but I measured .428 with a micrometer so it's probably slightly smaller yet.

I ordered a .427 sizing die as a trial to see what the effect would be of matching the bullet closer to the throat. I figured that would be a simple test before considering to have the cylinder modified.

Also, another question. I reviewed the SAMI spec and was not sure I read it right but it looked as though the spec was .4325, wouldn't that mean my cylinders were out of spec?

Thanks,

dan