My reply to the post is not about re-chambering a Number 1, but rather about re-barrelling a Number 1. What I was thinking about was putting extra barrels on one of my #1's, in 256 Mannlicher (aka 6.5 x 53R) & .303 Flanged 2 1/4" NE (aka 303 British). Looking at the thread sizes tells me it is possible even if I will have to use an epoxied-in-place artillery style breach section over the threads to "beef" them up to mate with the #1 action threads. The nice thing is that the barrels are new & already chambered. Have any of you gentlemen had any experience with this? I know, I am sort of re-creating an old Fahrquarson style rifle, but it is substantially cheaper to do it this way as the last .303 Fahrquarson actioned rifle I saw was advertised at $6,000. As well, it is getting harder & harder to get barrels here in Canada, coupled with the fact that very few gunsmiths, of the few there are remaining here, carry those reamers, so if I purchased barrels, plus reamers, plus had the barrels contoured, plus had them polished & blued, it would be a substantially more expensive & time-consuming proposition, than what I am contemplating.

I apologize if this thread of re-chambering #1 Rugers was meant to encompass & discuss big-bore rifles solely.

Thank you for the bandwidth.