I know a guy who’s got a rifle, “before” and “after” chamberings I don’t recall, though I believe one is the 7.62x54.
He just took a rifle barrel that had a corroded chamber, reamed it out to the other round, and reassembled.
The funny thing is that the fired brass has two shoulders, although it shoots pretty well.
He does not, of course, reload the used brass.
Yes that is the only drawback if you do not want to set the barrel back a few 1ooo’ths.........:o)
I will find my link too the angle iron scope mount base for the enfield for ya’ll !
Stay safe !