What powder is the 18.2- 18.7 load?
What powders do you have?
Bills advice is good, I havent shot or know of a 20VT that doesn't like AA2200. I know the primer situation sucks but I've found Rem 7.5's across the board to be my most accurate primers in different 20 cals until I step up to the BR case then 450's win.
I dont know how many rounds on your barrel but almost all barrels speed up from the 35-100 round mark around 20-75fps depending on barrel.
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