Haven't bought a new box of .30-30 for a LONG time, but the last I bought was Winchester Super-X 170 gr. I used that load in an old 1899 Savage lever gun, one with a 26" tube, straight grip, perch belly stock and crescent rifle buttplate. That load, in that rifle, liked to shoot groups that hovered between an inch and inch and a half at a hundred, off the bags, through a Redfield aperture sight and hooded Lyman front post.
First, and last time I took a .30-30 afield, it was that rig, south of Evanston, Wyoming, hunting on top of the railroad tunnels, in the vicinity of Sulphur Reservoir.
I'd hunted through some quakies, got back to the truck, and turned around to see a big mulie doe standing there. I took a knee, slid the safety off, and when the shot looked good, let it fly. At the shot, the brush exploded with deer, and they ran across the little two track through the sagebrush and stood on the sidehill about two hundred yards up. I couldn't make out the doe, so I got the 'glasses, and spotted one with what appeared to be a wet spot in the 'perfect' spot, but she didn't appear to have been fazed. I reached into the truck, and pulled out a .257 Roberts, put the scope on the wet spot and put a 115 Nosler into it. She went down that time. Climbed into the truck and drove up to the doe, only to notice that there were four legs in the air still twitchin' where I'd made the first shot......now I had two deer down! Luckily, the oldest boy came over the hill with his tag, and we got 'em out without much notice.
That 170 Silvertip demolished the lungs and heart, and stayed inside the animal, expending every bit of it's energy inside the vitals, just like they're 'posed to do.