I totally agree. With all of this (don’t tell Matt, plus, what the hell is unimpeachable?!)
ive been shooting ten round groups, off a mat and prone loading the bipod. At 100 yds I’m usually getting just under 1.25” That’s me being the weak link.
if you’re truly concerned the only true way to know is shoot off a bench with the gun in a sled or vise. Take the human out of the machine. If you know you pull a shot or two (or more) but are generally happy then forget it and practice those fundamentals.
also, 1:10 should be shooting 168-175 gr match stuff for accuracy for best results. Nothing wrong with m80 for steel and practice but if you want pretty paper targets then go heavier and test out some different stuff. I haven’t got a load for .308 yet but an example of 5.56:
Mk12 mod 0 rifle
1-7 18” SPR profile with rifle gas, likes heavies, mk262 shoots amazing. I cloned it with 77gr SMK, LC brass, 23.8 gr of Varget. It’s very close, maybe only 1/4 more for group size but costs a fraction to produce. The gun shoots my hand loads around 1” prone on the bipod with 10 shot groups.
you just got to find out what she likes