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In the end it's not a rifle, it's a tube of heat-treated lower carbon higher chrome steel with broached channels. That's how I'd make it slick, myself. The best bet would be to start with an under sized bore and lap it to size.
My shooting pardner has a FN Model 1951 Luxembourg rifle that had an undersized bore. It measured around .298", with a .306" groove diameter. We decided to lap it out, or die trying. We cast lap after lap and sent them through the bore several thousand times. We ended up it a .300 bore and a .308 groove. The rifle shot superlatively afterwards.
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