Peter:

Thank you for taking the time to measure your rifle. It is much appreciated. 5.4 mm = .212", which is a lot thicker than what would remain at the minor diameter of a 1" thread.

Bramble:

Definitely a BP chambering. I would not trust the steel in the receiver ring of any rifle of that vintage to help hold the pressure, let alone one that is cut away as much as the Farquharson is. One of the reasons I am looking at the 2-3/4" chambering instead of the 3" is that it would be more difficult to come up with a full nitro cartridge to chamber in it.

From the info I have the Gibbs Farquharson is .985 Major 14 Tpi ?

I have not carefully measured the diameter yet. It looks like 1" so I am sure you are right. Rough measurement suggests that the wall thickness at the minor diameter of the thread will be only .130", which seems pretty modest. Howsomever, there were a lot of Martinis chambered in .577-.450 and I don't think they had larger thread diameters. Do you happen to know what the thread size was in the Martini action?

Thanks for your help. I want to restore this action into something it might have been. It probably was an MBL but it will be a sporting rifle when reincarnated.

Best regards,

Glenn