Is it a 2groove savage or longbranch, they usually dont shoot boattail well at all. Have you tried mil surp mk 7 or other flat based bullets they may be better.
Obviously someone has had a 22 with it as glass bedding definitely was not done in factory. From memory the average lee was good for 4 moa, outstanding ones would do 2 or better and sub par 6, all were accepted as it was a battle rifle after all.
Tertle on this forum is a bit of a wizz on lee enfields so may be worth contacting.
Put up a few photos inc some of the groups and a few may be able to offer suggestions some helpful some humorous.
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