JTJ I understand the Nagants will be getting a U.S. Coast Guard approval very soon. You are correct it will allow them to be used as oars and boat anchors.
If it shot off POA, but grouped wekk, you just need a sight adjustment. M-38s, fresh from refurbishment, generally shoot very well. If it has had more than one American owner, all bets may be off.
"It is better to be too skeptical then too credulous"