Hi,
I posted a similar message on the wildcat forum, and I thought it might be also of interest here.
I had a Martini Enfield .303 in good shape except for a worn/ rusted out barrel, I wanted to retain the character of the old girl, but I also wanted a good shooter.
So, to cut a long story short, I had the barrel rebored to .38-55 specs. and left the chamber as is. It's no great task to neck up .303 brass to .375 and I'm happy with the result.
I can fire mild mannered cowboy loads, black powder, and also tooth rattling jacketed pills.
I just thought it might be of interest to anyone who has an old M.E. gathering dust.
Cheers ,
gazz.