Varget or TAC will work fine. I'm fixin to whip up a IMR 4064 load with 155 TMKs for gas gun this week. This is to save the Varget on hand for the guns that really like it.
For Gas gun, I generally want a little less pressure for reliable cycling compared to hotter bolt gun ammo. And my sizing die is different. (more "bump" for gas gun shoulders to feed) I was using the same sizing die once, but got a lot of Lapua Case separations because I was sizing my bolt gun ammo down too much. Very tragic situation.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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