Agreed. You must master all the fundamentals to shoot the 7.62 well. Once upon a time I did, nailing 10 bulls at 500 meters (20" bull) prone with iron sights.
It would take a helluva lot of practice to get back to that now, 67 year old vision allowing. Nothing like several days of "snapping in" to imprint muscle memory.
Ahh, Parris Island memories.....
500m with iron sights is some darn fine shooting. I have some optics on, so going 1000 yards isn’t bad. My buddy has a beefed up Remington 700, and he has shot it out to 1500 yards with a 10 inch group. It’s a versatile round heh.