The only en-bloc clips I've had trouble with are those on the Greek ammo (a little trouble) and the Tapco Chinese ones (a lot of trouble).

Some clips I've used dozens of times with both .308 and .30-'06, and based on that I have trouble believing they ever wear out.

It sounds like a problem with the rifle. If you'll PM with an address I'll be happy to send you some clips that work in mine.

CDD