I have never been a long range shooter, I don't think I've killed big game past 150 yards. I want to build a semi-custom rifle to start shooting longer ranges and kill a few groundhogs here in PA. I will likely never shoot at a groundhog past 4-500 yards but would like to stretch out to 700-1000 yards on paper/gongs for the experience. I would also like to keep ammunition cost and recoil as low as possible and not get overly complicated forming cases or wildcatting.

My original thought was a 22-250 with a fast twist barrel (1:8ish) to shoot heavier bullets. Maybe an AI. I also considered a 243 with a standard twist and 90-100 grainers. Of course now everyone is 6.5 Creed happy. What are some other options? What would you pick?