I've had two 1 in 10" Douglas barrels on a NULA 7x61 Sharpe & Hart Magnum (about the same ballistics as a 7mm Rem. Magnum) Shoots 140s to 175s very well. A Schultz & Larsen Model 60 in the same chambering with a 1 in 12" barrel shot 160s well, but never tried 175s in that one. I have a Sendero 7mm Rem. Magnum; don't know the twist rate in it, but it does well with bullets up to 160 grains. Haven't tried anything heavier.
