Hi all, I've pretty much decided to rebarrel my burned out 22-250 to a 22br. I'd like to go with heavy bullets and a long barrel; probably 30 inches. This gun will handle 300-1000 yards, where my 20 vartarg drops off. 1000 isn't something I commonly shoot, but 600 is. Is a 1:7 twist to shoot the 90s worth it? Or should I stick with 1:8 twist and stop at the 80s? Oh, another factor: I shoot at 5000+ ft of elevation in weather from single digits up to 80 or so degrees, so things that don't work for most folks at sea level work fine here. 1:8 might shoot more tolerant 90s. Thoughts? Opinions?