Not with the Sub-X projectiles yet, but have developed loads with shooternz's 151gr hp cast bullets and Trailboss. Subsonic for the 30-30 (16 inch barrel) and slow twist 308 (24 inch) was 7.5 grains of Trailboss, 8 grains for the fast twist 308 (16.5 inch barrel). I expect it will be similar for the 190gr Sub-X, maybe a touch more powder if it's a harder projectile
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