Okay, here we go. To argue that it isn't possible is a fools game, however I will boldly state the likelihood of any Lee Enfield to shoot 1 MOA out of the factory is slim to none.
Bisley Marksmen would "ball burnish" rifling and entirely rebed the rifles (read: a tonne of work) to get 2 or 3 MOA. To get 1 MOA from a factory Enfield, nah...like you say, show me. And I'll add that we like to throw terms like minute of angle around, and while we actually know what these terms mean, new shooters may not. So, below is 1 MOA. Groups of 5 rounds, fired at a slow cadence at 100 meters. All 5 rounds printing within a 1 inch square. To be transparent, this is not my target, rather an internet example. I personally cannot shoot this accurately without a lot of magnification, and not with .303 British. I personally doubt even with all that work put into a rifle that .303 British ammunition is capable of this accuracy. Tailor made projectiles and loads, perhaps...but we aren't talking about possibilities. We are talking about ROF product out of the crate and ball or hunting ammo.
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Making hits on a man sized target at 300 meters isn't difficult with milsurps. I can hit even moving (walking) targets at that distance with iron sights with regularity if I do my part...but hitting them vs piercing the flap of skin on an ear
5 times, every time, is beyond my capabilities, and certainly beyond the capabilities of a Lee Enfield and currently available ammunition. My friend, if your Enfields, in your hands, can produce these outcomes, you need to compete
chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://dcra.ca/wp-content/uploads/2025/05/NSCC-2025-Manual.pdf. You'll clean up. Gold medals and accolades.