Its hard to beat a 22-250, unless your using a 22-250 Ackley improved. The A.I. goes step for step with the swift and brass last a long time. I have one that Kevin Weaver built and its awesome out to 500, if the wind isn't blowing to hard. You said you wanted a long range round and since prairie dogs tend to live where the wind blows I say go bigger. The .243 or a 6.5 creedmoor are my personal favorites for that task. I have been using my Dpms 6.5 creed to shoot dogs out to 700 yards. Yes a 140gr. Bullet is a little big for dogs but when the wind picks up it drifts less.



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