The original magazine wouldn't feed the cartridges without hanging up.
I bought a new one, a Predator in .308, earlier this month. Wouldn't feed the second or third round reliably.
Took it back, because they offered to send it to Ruger for warranty repair free of charge. Instead of doing that, they swapped the magazine out of a rifle they had on the rack.
That one seems to work, feeding dummies in the shop, and live rounds in the bedroom (safety on). I'll take it to the range in a few days to give it a work out.
One thing I noticed with the original magazine, the edge of the case mouth would sometimes catch on the edge at the very front of the magazine. That might have been the cause of the hangups.
I thought of taking a round file to it to smooth out the inner edge, but we'll see if the new magazine works without messing with it.