I stopped using the Magtech load because I experienced primers falling out on a few rounds...I discovered it because one ended up in the bolt lug notch, giving me the only jam I have had. Then, I looked at the empty cases on the ground and found three more with empty primer pockets.
All I use now is Prvi and Remington.
GI ammo inaccurate? My first carbine was a Plainfield bought around 1980. At the time, there was plenty of GI surplus Lake City spam cans around...about $75 a can, as I recall. That ammo was quite accurate at 100yds. I really wish some importer would find a warehouse full of that stuff and sell it.
I am convinced from my reading that the issues in Korea are not overstated, nor are the result of soldiers firing their carbines at extended range.
One book in particular, "Last stand of fox company", discusses the carbine and it's failure at length.
The engagement discussed in the book mostly took place at extreme close range. There were multiple failure of the carbine to stop the north Koreans...to the point that the soldiers even did post-mortems on some of the dead. They found that many north Koreans were wearing homemade woven armor under their coats, and many bound their extremities to limit bleeding. That, and the heavy padded coats soaked with sweat and then frozen. Plus, the ammo was mostly Pacific war surplus that spent years in hot ship holds and warehouses.
The result, in that battle, was word being passed "Men with carbines, aim for the head". A fantastic book, maybe the best I have read on Korea.