i have two m-44 mosin-nagants. love 'em. got two handi's, too. i think a handi in 7.62x54r would be a far better choice than the 7.62x39. here's a curiosity for you: the old-fashioned lee loaders in 7.62x54r sizes for a .308 bullet, NOT the .311. so, you could go the .30-30 route, rechamber, bag you a lee loader OR get lee or rcbs or redding or somebody to twist you up a custom .308x54r die set. you'd have to do some ejector work, too.
OR you could re-chamber/re-ejector a .30-30 to .30-40 krag and get 7.62x54r ballistics. if nef were to chamber for the 7.62x39 or 7.62x54r, i'm thinking the .303 british wouldn't be far behind. in fact, even though i no longer own a lee-enfield of any stripe, i'd be all over a handi barrel - or whole rifle - in 303 british. it and the krag, in my view, are the perfect handi big game chamberings 'cause they got that wonderful rim. but until that happens, i'm gonna handload my .30-'06 handi to 30-40 krag/303 british ballistics, not that it doesn't shoot rem factory core-lokt ammo just fine. mid-levels pressures/ballistics and the handi seem a match made in single-shot/ejector heaven. :lol: