Ballistic comparision between Barnes 250g and 300 SMK at 5K ft., standard atm. pressure, 50% rh, 30 deg using velocities that I think are reasonable from a chambering like the 340Wby--someone can correct my est. MV's if they'd like to as I don't have a great deal of experience with that chambering. Just numbers, yes, but at some point, numbers can give valid comparisons.
The numbers for the Barnes are generous as it is using Barnes G1 bc of .425 (likely derived at 3k fps) for the entire flight of the bullet using Exbal.
The numbes for the 300SMK are derived using Litz's experimental data which show significant decrease in bc over the flight of the bullet. Exbal used for both.
300SMK at 2680fps MV:
@500 yds--2199fps and 3222 ft. lbs., 9.5 MOA ele. adj. from 100yd 0, 2 MOA for 10mph crosswind
@1K yds--1752 fps and 2045 ft. lbs., 26.75 MOA ele. adj. from 100yd 0, 4.5 MOA for 10mph crosswind
250 Barnes at 2900 fps MV:
@500 yds--2024 fps and 2275 ft. lbs., 9.25 MOA ele. adj. from 100yd 0, 3.5 MOA for 10 mph crosswind
@1K yds--1336 fps and 990 ft. lbs., 30.5 MOA ele. adj. from 100yd 0, 8.5 MOA for 10 mph crosswind
I know which bullet I'd rather shoot. Just me.