Re: getting a 243 savage barrel
First off i'd go with a 26" but atleast a 24" minimum id also use a twist that matches the reccomendations of the heaviest bullet I planned to shoot, personally for distance anything less than a 95grn berger is a waste and you may as well be shooting your 22-250, id use an 8 twist with 105 bergers, amaxs, or lapuas, or 107 smk's, Imr or H 4350 or 4831 are good powder choices, lapua is the best brass, br2s or 210m's are your best primers. Also get the varmint or sendero contour, I reccomend a sss, badger ordinance, or callahan recoil lug and a bell and carlson medalist A2. If you want to limit yourself to the 88grn berger and a few common slightly heavier hunting bullets a 10 twist will do, but you will likely regret it. Good luck.