Later Lee Enfields use an interchangeable bolt face to adjust for head space and I think the #1 MkIII has the same thing.
Have a gunsmith check this out before you do anything else. It's a cheap and easy fix if all they have to do is replace the bolt face to the next thicker one. It screws off and the new one screws on, check the head space and your good to go in most cases.
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