Lousy groups

[bob4wd]

Have a couple of Mosin snipers, one will consistently deliver 2inch groups at 100 yards but the other one ———really, really bad. Typical groups are 8 or 9 inches!
The really irritating thing is there will always be 2 or 3 shots (out of 10), that group an inch or two in every bunch. The bore is excellent, no pitting at all. Action is tight. Tried with and without hand guard, no difference. It has had metal shims installed at some point in it’s history, usually a good sign. Tried letting the muzzle end free float, tried shimming it. No difference.
It’s an older Century import Ishevsk, 1943, modern Russian scope, Mount is matched to the action.
Any ideas? Recrown the muzzle? Back-bore for an inch or two (would hate to do this)?

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