I wouldn't try that, the original 7.62 Nagant cartridge has a lot of case taper and a .32 S&W long would be greatly undersize at the rear and may split if fired in a Nagant chamber. Even if safe to fire it would be inaccurate since the Nagant chambers are cut for a full length case and the .32 bullet would have to rattle down the oversize chamber before reaching the barrel. I've owned three Nagant Revolvers over the years and none were very accurate even with proper ammunition. I have a .32 ACP replacement cylinder and that was not very accurate either so I rechambered it for .32 H&R and that was only slightly better. Nagants are nice and light to carry but I don't know why one would carry it, it's underpowered for personal defense, the double action trigger pull is horrendous and it isn't accurate enough for small game.