matt,
Just a couple of idea's, if 60gr. bullet's is as big as you want to shoot then a 22-250AI will do everything a 22-243 will do with much better barrel life. another idea is a 22-6.5x47Lapua.
Did a 22-284 years ago (not that much bigger than a 22-243)and barrel life was about 500 rounds, not hard carbon as safariman suggest's but 4" of firecracking in the throat.
btw Lapua makes great new 22-250 brass that fireforms nicely to AI
