Check to see how much powder it will take to fill the case. If the .35 Rem. case will hold 30 - 40 grains of BP (compressed when loaded) then a 250 gr. bullet (lead, not jacketed) would make an OK target load, but I'd think twice about hunting big game with it. M.V. is going to be about 1400 fps tops.
Fact is, the .35 Rem. just wasn't designed for BP.
Fact is, the .35 Rem. just wasn't designed for BP.