Rounds do not feed - Duramag 6.8 SPC/.224 Valkyrie/22 Nosler Stainless Steel 10 Round Rifle Magazine

I bought a 10 round 6.8 SPC magazine thinking a 6.8 SPC specific magazine would be better. They do not work. The rounds do not feed from the magazine into the chamber. The rounds bind so badly I cannot even use the forward assist to complete the feeding and chambering process. This happens with one, two, all the way to 10 rounds loaded in the magazine. I tried loading a round into the chamber, closing the bolt, and then inserting the the magazine but a second round failed to feed after firing the first. On a side note... the gun operates flawlessly when I use my regular Magpul 5.56 magazines.