UKicon L2A2 ball, Australianicon F4 or Canadianicon C21 Ball are all a bit better than US M80 ball. Well under 2 MOA.

UK L2A2 Black spot, Portuguese M963 and FN SS77 ammo is usually below 1.5 MOA out of a tight bore.

Better lots of FN SS77, HP S-Patronen 58 and West Germanicon MEN/RWS 7.62 NATO DM41/DM111 are all near match qualify, near the accuracy of the Swissicon GP11 out of a correct bore/chamber combination. Out of the L39A1/L42/SSG69 any of those combinations should shoot near 1.25 MOA or less. Certainly out of the light barrel special barrels,which are close to the L39/L42 bore, they shoot quite well (based on M69, Omark, Canadian LBS Longbranch tests)

That is why I was snorting, he picked the very worst ammunition for the demonstration. M80 ball has difficulty doing 2.5 MOA out of a match gun with US or commonwealth tolerances, at least in my experience. For example the US Navy, when they developed the 7.62 Match Garandicon, while they expected near 1 MOA test results at 100 yards with select lots of NM66 or 67 M118, only expected 2.66 MOA 10 shot groups when used with the navy contract M80 ball, which was loaded with IMR4475, which should have been better than the WC846 ball powder. Fact was M80 ball was not and never has been very good. M59 was terrible

Not that it matters at 40 yards, but it would have been a much more edifying test if he laid down at any range, with a tight sling or sandbag rest and delivered a reasonable 10 shot sting with UK Black spot, then shown the target. A nice tight grouping with decent ball would have been much more impressive to the average observer.

Just my opinion.