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I agree with N310,
I have reloaded and shot the 300 -221 from a custom bolt setup for the past 3 or 4 years and have found H110 too erratic for my needs. I pretty much have gone to Lil'Gun for my subsonic needs.
Now, this is what MY gun likes, YMMV,
I have found that 8.8gr LilGun under a 308 Lehigh/20gr. Berger .17, CCI small rifle primer and trimmed 221 brass produces just about 1060fps all day long, no more bouncing up above speed of sound as temps climb or barrel heats up and transfers to round sitting in chamber for a few extra minutes.
Gary
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