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My experience with M1903 M/S barrels is that they all measure .268" in the grooves. I use nothing but Hornady 160 grain .267" bullets intended for the Mannlicher Carcano.

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Now that really is interesting and addresses my original query xausa.
Did you somehow slug your barrel before trying those bullets, or did you just take a flyer & try it?

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I am not Xausa, but I did that very thing on his range with my 1903 T/D rifle. He had loads with both .264 and .267 bullets, and I accidentally tried the .264s first; They keyholed at 50 yards. Then I tried the .267s, and they shot superlatively.

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