Well you should do just that and check the records.Its improved a lot actually. You have to look at agg records. Individual small groups are usually flukes, although 3"s are now not uncommon in HG. I only have records back to 2005 from the IBS, but the LG 10 match agg was 6.183" (10 5 shot groups) the HG agg was 7.499" ( 10 10 shot groups). Today those aggs are 3.794" and 5.337". A considerable improvement in only the last 15 years. If I could find records from the 80s Id guess they would be 2-3 times larger. So there has actually been a huge improvement.
What Im telling you about hits on rocks or clay birds are not as centered as you think. I sight in on small rock all the time and go directly to paper for group and its hard to get closer than .5 moa to the aim point. Thats just not a good enough zero to verify drops in my opinion. And hunters should care about measured groups, thats how you predict your hit %. If the rifle is not shooting well enough to hit the intended target consistently you should fix that before worrying about all the other stuff. Accuracy gets blown off by a lot of hunters, but I can tell you a really good shooting rifle will make you a lot better shooter. Just my opinion. But the fact is no matter what your doing, if your putting rounds down range and paying attention then your learning.
And when you do you will find im correct.
in fact the first (official) 1000 yd 10 shot group record was about 7 3/4“ shot in about 1970 at williamsport with a hunting gun, as most of them were back then.
Mind you im not saying there hasent been improvement, but i am saying it has been a very slow process.
As for the aggregate, you might just be confusing the 5 shot with the 10 shot.