Are you sure on the 1-12 twist? The 243 Win was originally 1-10, and there's hardly enough room in a 243 barrel to completely bore out the rifling and put in a new one in 257, unless the rifling is very shallow. And 1-12 doesn't stabilize a lot of bullets for 257.
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I used to love being able to hit hard at 1000 yards. As I get older I find hitting a mini ram at 200 yards with the 22 oddly more satisfying.
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