well, some examples:
Bone stock K1V .223
Bone stock .475 Turnbull
bone stock 1976 1B .270 Winchester
One time I had the .270 above at the 50 yard bench. I was shooting other things and decided just to double check zero. I fired one, and it went where it was supposed to go. I fired two more and became concerned, because no new holes appeared . I adjusted aim an inch higher, and a single new hole appeared an inch above the first. With a 10x scope at 50 yards, I could not tell that there were three bullets in the first hole.