Back in the 50's when PO Ackley came up with his wildcats they were a great improvement, compaired to some magnums, they burnt about 5% more powder and about 20% increase in velocity, where a magnum does juat about the opposite from the parent cartridge. But now a days in a given caliber there are so many choices that you do not need to do an improved unless you just want to be a gun loonie. For instance a 257Roberts into the 257 AI is about the same as the 25-06.
Bob
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