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You guys might try checking with Dave Manson at Manson reamers. He's been making some oddball stuff and I got my 300-221 reamer from him. His stuff is all top quality and the customer service is better than any of the others I've dealt with.
From all I've read the small rifle and small pistol primers are the same outside dimensions with the thickness of the cup and material hardness being the only difference. Its the large pistol primers that are shorter than the large rifle as they share diameter too. That means loading the 357 max cases with small rifle primers is a very doable thing and recommended if the pressures are up there. I know guys who load small rifle primers in a number of high pressure handgun rounds as a standard procedure.
Looks like an interesting round to fiddle with and I was at the bluing guys shop today looking at a few max's he had on the bench and thinking how well they would do for a whisper type round.
Frank
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