I have 300-221 built on Rem. XR-100 action.
Have done much trying/testing with many fast pistol type powders and have settled on LilGun for subsonic rounds.
Clean. efficient and easy to meter.
Keep my loads in the 1030-1050 range and usually shoot 200 cast up to 240 SMK's.
Very happy with the LilGun loadings.
Give it a try.
Gary
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