Wolf .223 binding in Ruger Mod 77 Mark ll

[BigBore]

I have a problem with .223 Wolf ammo. On my Ruger .223 Model 77 model ll I can not get the bolt to close without some serious pressure on the bolt handle. When I open the bolt and look a the shell it has what appears to be rifling markings on the bullet. I not not shot one of these rounds. I do not have this problem with Winchester, Ultramax or my reloads. Wolf .45 ACP in my Kimber 1911 never has caused a problem in over 2,000+ rounds.... any ideas. Thanks