Tim,
I also have some time in on this caliber. Check the neck diameter of your loaded rounds. If it is more than .328 you need to either turn the necks of the cases or ream the inside of them. Loaded round that are too large in this dimension will give you VERY high pressures. The book "Wildcat Cartridges" from Wolfe publishing has several articles on this cartridge. You should be able to locate a supply of cases for conversion locally, but if you can't, e-mail me. I have a rather large supply.
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