Rolland, even if you can find an original barrel it will most likely be way to short or way to long and probably in fairly average condition especially the bore. Considering that yours is a project you are realistically better off re-barreling with a new barrel which will have the correct bore and groove size for 0.264" bullets and the headspace can be set correctly right from the start.

I have two model 1895's, one with a 25" barrel and the other with a 26" barrel. I am happy to give you the original dimensions so that you can get the barrel profiled to same profile as an English sporter.

Matt.