It certainly is a personal level isn't it? I really don't know what my level is as it is all over the map depending on the gun, the load, the position fired from, hangover, mood, moon phase, etc. I have probably been punished the worst by 400-grain Speers loaded hot out of a Marlin .45-70, and by patterning 12-gauge 3-inch turkey loads from an H&R single shot. Teeth-gritting stuff. I have been been stung the most by a light .338. My collarbone has probably had its worst outing when I tried to fire a prone match with a Trapdoor Springfield .45-70 using heavy bullet BP loads. Something about that steel buttplate and a very thin summer shirt made me lose interest in the target after only about 20 rounds. I find I really don't look forward to bench testing much more than a box of .375s out of a Ruger No. 1, and the No. 1 rechambered to .450 NE was unpleasant from the bench after just a couple of five-shot strings. On the other hand, I was surprised how much fun I have had with up to 150 grains FFg and an NEI 835-conical out of a Pedersoli Kodiak .72 double percussion rifle. I think it was all that lovely mass out in the barrels.
Stock architecture is important to me, as I have a somewhat long neck and high cheekbone. Enough blathering ....