I wouldn't want to shoot NE rounds in a BPE rifle - it's about 2 lbs light in the first place. You'd take quite a beating.
I don't think I'd use NFB loads either in a gun that early (or any BPE rifle, actually) - the barrel material is fairly soft, and the risk of ringing the chambers is too high.
Reproofing is not necessary in this case, and a good way to strain an old gun beyond repair.