Grandad bought a handful of sporterized No.4 SMLE’s in the 1950’s and passed them to the in-laws.
All lived the life of bouncing in the bed of trucks and other abuse.
Norma ammo was the common in 180 round nose & 150 psp. The 180’s using the 300m peep were 6” high at 100 yrds and the 150’s dead center at same.
Ammo needs to be mic’d before purchase. Too many have been selling .308 pills instead of correct .311’s.
That may have been the problem with the link’s test firing @ 50 yrds. For decades, people have been selling 303 “ball” ammo that had been reassembled with .308 pills.
I still have one of those truck rifles. Every few years I take it out and fire it once; 150 gr 311 softpoint at a red milk jug cap at 100yrds…hit.
Almost 20 years ago, I purchased an Armalite AR-15 with a 7.62x39 upper and matching magazine. It remains unfired to this day. The barrel is .308 not .311. I asked Armalite if it was safe to use .311 Soviet 7.62x39 in the rifle. I didn't like the answer. It remains unfired until I can acquire reloadable, boxer primed brass and .308 bullets. Armalite discontinued the upper. I had purchased it in hopes of getting a sub-MOA performance from the box of .311 ammo in my possession. I have 2 bolt action rifles chambered for .311 7.62x39 that solve the accuracy problem. The sloppy old Romanian SKS fires that stuff reliably, but not particularly accurately.
CMMG has produced an AR/AK pattern rifle that will do what I originally wanted. It hasn't been a priority to buy one.