In general, my most accurate are my Finnish mosins. My M39's are all 1.5 MOA or better. My M27's are similarly accurate.
My K31's are also very accurate.
My Enfield #4 Mk 1's are very accurate.
My M98/22 mausers are very accurate.
My worst would be my semiautomatics (SKS, AK, Cetme, SVT 40, etc). Generally they get 3-5 MOA.
I also have a few individuals (M91, #1 Mk3 Enfield, Soviet M91/30) that get horrible accuracy.