I prefer cast bullets in my 357s but I tried a few loads recently with
125 gr Sierras in my S&W md 28 with 4" barrel. Velocities are with mid
point of a Competition Electronics Chronograph aprox. 12 ft from the
muzzle.
1. 21gr W296 WSPM primer = 1331 fps.
2. 17.5gr 2400 CCI 400 SR primer = 1373 fps.
3. 8.2gr W231 WSPM primer = 1285 fps.
Appearance of the fired primers indicated that the 231 load was at
higher pressure than the other two as the primers were much more
flatened.