This is the best I've done, sandbag on a bench @ 50 yards:
1) .22 S&W Model 17-2, 6" barrel, 7/8" group, Ely match
2) .357 S&W Model 686-3, 6" barrel, 1 3/4" group, 180gr SP/12gr 2400
3) .44 mag S&W Model 29, 6" barrel, 2 3/8" group, 300gr XTP/17.2gr ACCUR#9
These guns are the result of many years of trading to find the most accurate. I'm now looking for a S&W .460.