I shoot a collection of old hunting rifles, none of which will consistently shoot sub MOA. Mostly they (or maybe it's me) seem to shoot about 1.5 or so from a steady (at least as steady as I can make it) prone position, with peep sights. Although I'd prefer them to do better, it's good enough for my purposes (I wouldn't attempt a shot at much over 250m in the field). I do have one scoped rifle, a '98 in .308 Win with a ss barrel but it doesn't seem to do much better than 1.5 either.

Strangely, when I used to shoot BP competitions some years ago I had a .45 M/L target rifle that could put 5 shots into 1.5 at 100m, at least from time to time, using paper patched bullets. That was a damn good rifle.