Having recently inherited my Dads Browning 71, I too am in that same search. After number rainy days hours web searching, I have concluded that one of the most repetitive loads for the 348 Win is 59 to 60 gr of IMR 4350 behind the 200gr Hornady. No experience yet, but close.
I have 15 rounds all loaded up with 55, 57, and 57 gr of IMR4350 and the 200 gr Hornady. Plan to shoot soon if the rain and work let up.
