So, if you are confident that your aiming and holding was reasonably consistent, 40% of your rounds were not hitting a target about what, 20 inches wide at 50 yards? That's more like a shotgun than a rifle.
Keyholing at 50 yards - that ain't right.
You've visually inspected the bore and it appears to have decent rifling and be straight with no bulges etc.?
A Mk1/2 is a post-war refurb, so likely to be a half decent barrel...
Have someone who you know is a very good shot put some rounds through it and see what result they get with that ammo, and have some flat base .303 ammo on hand for that person to try as well?
If that person gets similar results you will need to investigate the condition further and some of us can help with that.Information
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