Re: Button or cut?
Lilja barrels are button rifled, and I don't think anybody makes a better barrel. I've also used Shilen, Hart, Brux, Lawton, Krieger, and Walther. None of them are more consistent or accurate than Lilja's.
I don't expect much from factory button-rifled or hammer-forged barrels, but between the top custom barrel makers, my opinion is that you can just take your choice.
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A big fast bullet will beat a little fast bullet every time