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Hey res45, are you just running the. 308 brass thru a .300 Savage full length die or do you use the form dies?
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That's it,I just lube the case good and run it through the 300 Sav. FL sizing die. The case will fire form to your chamber dimensions and you can neck size from that point on depending on what type rifle action you have.
One thing you need to take into consideration is the that 7.62 x 51 brass is thicker so case capacity is less and pressure will be greater with an equal load than in the reformed 308 brass or factory 300 Sav. brass,you can verify this on your chronograph so work you loads up with the reformed brass carefully.
One thing I did find as a plus is that using the reformed LC brass vs. commercial brass and and equal load of powder is that I got on average about 100 fps. extra MV out of my cast bullet loads using the LC brass.