Hmmmm. Why the conversion?
I like the Enfield idea.
http://www.jpfo.org/smle.htm
A little mission to help the Karens out of chang mi thailand required the use of good enfields with crappy 303 surplus ammo. The Cups ets is same 56,000 +/- as 7.62x54R and the "captured RPD, SVD/FPK ammo works very well. If ya reload you'll want to set the barrel back a few thousandths to prevent fire forming of the brass but at 113$ for 1400 rounds it's not something I worried about....
Kitchen table conversion of a quality rifle with a few handtools as described to a better quality shooter and cheaper source of ammunition, bought or captured !
Good luck !
Stay safe !!