I would try it in 7.62. If it didn't I would mess it up and rebore to 9X39 fast twist. Then thread and load some heavy cast .358 bullets. But I am a medium bore whore. Be Well, RZ.
I’d rechamber to .303 Redgwell (aka British) or the full-sized Russky.
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The 30-303 shoots well. As you know, I have two rifles chambered in 30-303. A No 4 Lee Enfield and a TC Encore. A couple of weeks ago, I took possession of an MGM 7.62x54r. I haven't fired it yet, but will soon. Both these rifles have .308 diameter barrels - 1 inch untapered tube, 26 inches long.
I agree with DD, my No1s needed some work to get them to shoot. Not so with the TCs. I might have just got lucky, but my Encore shoots 6.5 Grendel and 30-303 very well. Some 30-303 targets are below. The only thing I did was get rid of the plastic OEM stock and replaced it with a Boyds laminate.
I have a 7.62x39 barrel for my Contender. Like the Encore barrels, the 7.62x39 is a 308 diameter tube. There are lots of bullets around.
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