I use USGI clips because they are the only ones that are rounded on the ends to push the ejector out of the way if it's flopped over in the recess for the lug. I tweak them with pliers on the end to make sure they are tight. Mine have only one tab folded down and I use a rubber band to secure the cartridges until it's time to load.
Phillip McGregor (OFC)
"I am neither a fire arms nor a ballistics expert, but I was a combat infantry officer in the Great War, and I absolutely know that the bullet from an infantry rifle has to be able to shoot through things." General Douglas MacArthur