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I have been shooting wildcat's for 35 years. some of them great some not so great .. most on the 63mm standard case.. I knew P O ackley and his improve starts at the 7mm anything smaller is a waste of time & the Brown Whelen is useful @ .338 and above. I think my best results on the ackley case is a 338.06 Imp and the best Brown Whelen is the 35 BW and The 375 BW are ver efficient rounds.