I'm glad all you guys like those 2.5" k's. I'm a far worse shot with my 2.5" 66 than either my 4" 586 or my wife's 3" 60. I've settled on 357 158s at moderate loading, 15 grains of H110 I think off the top of my head. Darn handy size, and feels great in my hand, but I'd ruther a 4".
