Im doing the opposite, Im transitioning to 150s for general use, and possibly to the 130s if they shoot well in my guns and I end up in Az more. With both my limited poor results with the 170s and my wimpy shoulder, when i was going to get some more brass, I did the math on what components cost vs factory loads, I just went and bought some 150 gr factory stuff @ around $14/box. The extra couple hundred feet velocity is fine by me, faster expansion, flatter shooting at 500 yards! according to the Winchester advertisement and Im not really carrying the 30-30 around in grizzly country much or actually hunting with it per se. Hunting for me is scoped bolt guns in flat shooting calibers. Walk around and day to day guns are a different set of use characteristics.