I ran a hundred rounds thru my mod 10-7 revolver today, it has the thin profile 4" barrel. Ammo was CCI Blazer (alum) 125gr +P .38sp jhp and Black Hills 148gr HBWC. I have chrono'd the Blazer load in the past from my 4" 15-2, it ran 1025fps on average, I'd expect the same in this gun. Never chrono'd the BH wadcutters, but based on others' chrono work, mid 700fps is a safe bet. All shooting was 25yrds standing offhand, DA. The Blazer stayed in the black, which was OK, though I was disappointed not to keep all 50 on the sticker (or 8 ring). The recoil is more noticeable with the lighter profile barrel, but certainly nothing to write home about- there's std pressure loads hotter than this stuff. Point of aim was top of bull, 125gr hits a little low from this fixed sight K frame; they are sighted for 158gr ammo. The five shots below the gun were Win PDX1 130gr jhp +p loads I had for the snubby, group measured 2.25", I held 6 '0 Clock on bull for that. THose typically are right at 1000fps from a gun like this, too. The Black Hills wadcutters were a little better for me, right in the middle on windage and a dead-on hold. I still managed to throw a couple in the 7 ring, dammit. I still need a Tyler for this one, and there's a slight hitch at the beginning of the DA pull, but otherwise perfect, no malfunctions as usual. I love the K frame.