That M21 test says nothing about the ammo or rifle. I have had rifles that shot one factory load sub moa and another different one over 4"
all depends on what the gun likes, but handloading usually brings out the best in a rifle.

I have one rifle, a 280 AI custom built that shoots Nosler ammo with 140 gr accubonds in .3 moa groups and 162 eldx precision hunter ammo in .5 moa groups. bought a bunch of the Hornady stuff and haven't bothered reloading for it.

Then I have an import 7-08 that shoots 150 gr eldx handloads into half moa groups (bullets seated way out) and will not shoot factory ammo under an inch. I figure the throat was cut for longer round nose bullets, So this on eI load for...

SnT