WHAT JACK SAID!!!!!!!!!!!!!!!!!!!
The loads in Ackley`s Book`s are all very hot at the least and very dangerious at the most. Most of the powders he has loads for have been slightly improved over the years and that makes the loads even more dangerious. I would recomand that you start with the data for the 6.5 x 55 and work up to alittle over max. for the parrent round. I would guess you`ll get about 5% more powder in at the same preasure, THAT`S A GUESS., and that would get you abt. a 2 1/2% increase in velosity.
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Catfish
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