I guess I'll add another.
Don't have more than one can of powder on your loading bench at the same time. When you empty the Varget remaining in your powder measure into the can of H4831SC it screws up the burning rate.
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Been there, done that....I have some 95% R15 / 5% IMR 4350. Works great for 308 sight in ammo, but wouldn't want to push any loads near max with that can of powder.
