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This is EXACTLY the answers I needed fellas. Thanks so much for the info. I think I'm going to drop down a bit, use a combination of the RPM, factory intended minimum twist rate, and of course accuracy at a distance. I think this will make me a happy camper if I fall within those guidelines...
If I would have read this post before posting my question I may have refrained. But I guess my question still matters in terms of how people deal with marginally stable bullets. But I'm guessing with this calculation if I reach RPM's in the 260,000 I'm sitting pretty good with what I've got...
Long story short I built a 1:9 22-250AI. Yeah, yeah, yeah, 1:9 for this cartridge isn't ideal, but the .223 barrel I reamed out was cheap. anyway, it shoots the 75gr ELDM's really well at decent velocities (3250fps), however when I start using the Berger twist rate calculator is it marginal at...