Re: good factory load for a SCAR
I have shot a good amount of Remington UMC (over 1,000), some mexican aguilla (dunno like 500 rounds of that in this rifle), whatever Wal-Mart or the gun store had (over 1,000) and then Federal 62gr green tip (no idea how much).
It has had no stoppages, ate it all, the mexican ammo smells weird, and is a tad bit harder to clean, but just at that piston area and to be honest I do not clean that often.
So, my SCAR eats it all, doesn't care, only thing it cares about is when my thumb gets in the way, the rifle says HEY BOSS I LOVE YOU HUG THUMB! Stoppages on that I do not count btw, cause the rifle didn't make that mistake, it is me.
Accuracy with the 55gr was fine, could shoot good distances and hit stuff with an ACOG, but the 62 gr definitely hit 600 yards more often.
Not sure if that helps or not, but the only thing I have not really shot through mine is wolf, I had a bad experience with it in a Bushmaster years ago. So I steer clear of it, but others do not have problems with it.
You can find some of that green tip for a really good price, but some ranges do not like steel ammo, but it is pretty cheap. I like it better than the other stuff I have shot as of late, I want to try out 77gr with the SCAR but I have not done so yet.