I saw the TNOUTDOORS9 test on the Buffalo Bore and it left me unsure. It had good penetration but only so so expansion. I am not sure if they are using a harder lead for the bullet. Of course it is a sample size of one. I picked up some of the Winchester Train and Defend 130gr JHP. It says it clocks at 900fps and I am assuming that is a 4 inch test barrel. It is also standard pressure and low recoil so I think it should serve well in a heavy all steel K frame.