Lake city manufactures combat cartridges as well as match cartridges, high quality with boxer primers. Military none the less, with my Garand, 2 1/2" was normal, with LC surplus, and it held up real well out to 900 yard, at 1,000 everything went to hell. I had a really good shooter, explain the facts of 1,000 yard shooting to me, and I felt better.. My bullets were going subsonic, and when in the pits, you can't even hear the bullets hit the paper ( 1000 yards ) , or see the impact of the bullets,, unless your watching closely.
I'm lucky , I have a large surplus of 147 grn, czech ball, that in my M1a shoots 89% possible score if I do my part. That's 1 1/2" at 100 yards + with iron sights.... Really good out to 600 yards.
Haz, what can I say, the golden era of good surplus is gone. In sporting rifles, military ammo is hit and miss, some primers are too hard for consistent ignition, usually US will go bang, but some Euro stuff, won't.
Give us a report on your findings.