I'll still vote for the 220 Swift, like the man said it's legendary. My opinion on one matter. All my Swift's have a 1-14 twist & handle up to 65 grain if I keep the velocity smoking. If I were going to build one, it would be a 1-12 twist. The reason for this is mostly you'll be shooting 50 & 55 grain for varmints. At a twist faster than 1-12 when shooting max velocity the rpm's will be too high & spin the jacket off creating poor accuracy. Just my old 2 pennies worth. Just to mention I also have 22-250's that shoot great, they're just not a Swift. They are easy to load for accurately, just pour 35 grains of Varget & jam a 55 grain bullet & presto. 22-250's- Sako L579 & Remington 700 Varmint. Swift's- HS Precision, Remington 700 Classic, Remington VSSF I, and Ruger Varmint/Target.
Jim D