I purchased a used 80 back in the early 80's, no one except firearm clubs seemed to have a chrono back then. Anyway we were going to chrono our fullbore pistol rounds for an up coming competition, so out of interest, & due to the fact that the .22 80 was knocking over rabbits at 40yds, i decided to chrono it, yep it was 20ftlb, so having an fac i had it put "on ticket".
As you describe it was a great rifle for that middle distance between sub 12 & 22rf. just before Hungerford i had it taken off & returned to sub 12, back in more enlightened days, how times have changed