Real world testing. Same bullet weights from a 2" barrel. 125 gr Federal JHP 38 Special - 847 FPS (not +p) 125 gr Federal JHP 357 Mag - 949 FPS Less than an eighth difference in velocity for much less recoil and muzzle flash is well worth it IMO. I can shoot follow-up shots much much more quickly and accurately with 38+p than I can with 357 out of 1 7/8" guns. Rent both of you have the chance. http://www.ballisticsbytheinch.com/38special.html#RW By the way, the link you posted is for a 3" gun. That's over a 50% increase in barrel length over the common 642 or LCR.