I opened up some 308gm and found 42.8 grains of powder that looked similar to 4064 in the fc brass and 210m primers I'm sure it's not exactly 4064 but it's a good place to start. I like varget and 4064 in mine.
As for the price of gm308 I get it for 23.99 usually so it's not that bad compared to plinking ammo for $20 a box but yes my reloads are cheaper for sure
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