I've got Hot Lips and Steel Lips from Butler Creek and haven't had a problem with either in my gun. I even have 4 of the 50 round Ramline's and I haven't had any problems with them either. They feed just fine in my gun running Federal bulk, even when I load them all the way.
I 2nd or 3rd the Steel lipped Hot Lips from Butler Creek. Have never had a issue with one.