I’m a long time 7.62x51 shooter,but you should see what some .22-250 loads penetrate under 100 yards.YouTube has some videos available.
I shoot primarily the Russian calibers but I only shoot 1/2” AR500 with the 54R at 100m (swinging gong) and 3/8” AR500 with the 5.45 and 7.62 at 50+m (static and angled down).
Not a big fan of the 5.56mm but 7.62x51mm is the best U.S. caliber (M14) then the 30-06 (M1 Garand.) My Walmart is filled with the more interesting rounds like the 250. I would love to shoot a .45-70 and .45-110.