A standard 22-250 or 243 would be my choice in your area. I have a 22-250 Improved with an 8 twist for shooting the 75gr a-max but the barrel is really too long for your preference. Learn to read the wind, I shot tons of prairie dogs over 300 yds out to 420 with my .223. I will admit these would be anemic on a coyote at this distance. 75gr out of a .243 stevens would be my first choice.
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