Re: Now that you\'ve talked me into a 6.5x284
If it were a match gun, I'd say stick with the slightly tighter twist for the cold weather as mentioned above. For a varmint rig, pick whatever you like and have fun. The 284 isn't gonna shoot fast enough to blow up your bullets like a 300wby would so I doubt that that's gonna be a concern. Question is, what climate do you shoot in, and how often do you shoot 800+ yards in those conditions. That's where you're gonna see the difference, if you do.
If you have something that you disassemble and reassemble enough times, sooner or later, you'll have two!