Previous posts against the FMJ are correct. They're really hide wreckers. I've never tried the rate of twist you're asking about but would guess you could shoot the heavy, long bullets and though you'd be overstabilizing the shorter ones they would probably still shoot okay if they held together. I've hunted coyotes since '69 and that includes 14 yrs. of predator control on National Wildlife Refuges for the USFWS. In .222's, .223's, .22-.250's, and .220 Swifts the best bullet I've found for coyote hunting is the Speer 52 gr. HP. It kills instantly with good hits and does no or very little hide damage, usually not exiting. If your rifle won't shoot this bullet, which would be rare in my experience, you might try the Hornady 55 gr. SP (not SX). Good luck.