"Perhaps side by side testing of .30 gov't ammo of the same vintage?"

That would somewhat level the playing field for a low budget, low tech practical experiment such as this.

Last edited by S99VG; 10/20/20. Reason: added quote
"The universal aptitude for ineptitude makes any human accomplishment an incredible miracle." John Stapp - "Stapp's Law"
"Klaatu barada nikto"