I have a friend, long range competitor, shoots a 7mag at a 1000 yds, and Remington 700s right out of the box mostly shoot so well no reason for lots of things being done to them. I would put a Jewell trigger in one, but have 2 I haven't and they shoot fine. I have a 5 shot group, one of several, as don't set around shooting groups, this one was while chronographing, and is 5/16ths inch at a 100 yds. I don't recall what the 243 does, but about the same kind of thing. Before I would change out a barrel, and such, (other than trigger and I never put the Jewells in the 223 or 243 yet) shoot it and see how it does. Unless you just want to spend a bunch of money.