.243 will kill deer DRT and 22-250 doesn't play games either.
Got that right. All one of my buddies ever uses on deer is a 22-250. Deer are not hard to kill... I'd buy a new fast twist 22-250 and play around with some heavies.. I'm limited to what I can run in my 1 in 12 and 1 in 14 twist rifles, but even the lighter pills whack deer pretty good. 55gr Hornady interlocks come to mind... For the op's requirement of 200 yards. Damn near anything will work.