Carcano
I had one with a cut down barrel. The barrel was 18". I believe the last 7" of the original barrels were 1-7" twist. The barrels were gain twisted from 1in12" to 1in 7". I checked (measured) the twist on that barrel; it was a straight 1in12". It would shoot only 100gr bullets. Anything heavier would keyhole. That barrel was a .264 diameter. I have two other Carcanos and one is a .264 the other is a .268.
Jeff
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