How does forming 25-06 from 30-06 double the brass life?
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By itself? Probably not.
But if the choice of 30-06 brass is made for quality rather than simply price, there may be benefits for the added expense.
Never shot much 30-06 but with 308WIN I get three to four times the number of loadings with Lapua Palma brass than I could ever manage using Winchester, Norma, Remington....
I have yet seriously to evaluate cases from Peterson Cartridge or Alpha Munitions but from what I’ve heard said they’re both worth the money.