Wikipedia notes data from COTW.
Larger in diameter than .30/06, smaller than the .376 Styer.
Modern powders would do well in it, for sure.

347 gr (22 g) SP 2,200 ft/s (670 m/s) 3,830 ft/lbf (5,190 J)
347 gr (22 g) SP 2,230 ft/s (680 m/s) 3,870 ft/lbf (5,250 J)
347 gr (22 g) SP 2,250 ft/s (690 m/s) 3,900 ft/lbf (5,300 J)