On an SB2 frame it would be fine, not on an SB1 tho. The 1:15½" twist 357 barrels would work great, a 1:18¾" twist, if they exist, may not be so good with big spitzers. I've shot 250gr spitzers in my 35 Whelen which is 1:16", it works fine out to 100yds anyway, under 1" groups.
Tim