I have been using the Missouri Bullets "IDP #1" 200 grain swc brinell 18. My standard load is 4.8 grains #231 with a WLP primer. After 200-300 rounds I do get some leading. It is not enough to affect the accuracy, but I can see it when I am cleaning the barrel. I could be using the wrong...
You could try STI. I am pretty sure they sell a conversion and most of their guns have ramped barrels.
http://media.stiguns.com/ProductDocs/Catalog/STI_22LRTopEnd2010.pdf
I just joined THR today and found this thread. I started loading for my 45 ACP a couple of months ago, and just placed my second order with Missouri Bullets last week. Great bullets, to bad I missed out on the discount.
Bob
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