I have a couple boxs of 30cal 190 accubonds
And a whole bunch of social distancing time

What powder should I use for my invention
I tried r17 and got good velocity but erratic accuracy


In the cupboard on hand I have
R19
Big Game
V550
R17
Varget

I have a 20" barrel, shoots 1/2-3/4" groups w hornady factory ammo

A 20" 6.5 shoots 140g at 2600fps or so

Looking for that or faster w the 190's

What do you think?