I bought some mags from CDNN, these were some type of contract mag. They're only cut for the m16/ar15. The problem I'm having is that as I load the mag one or more of the rounds down inside the mag will move forward and start binding things up. At first I thought that there were burrs on the inside of the mag where the mag catch and the cut on the back for the clearance of the bolt hold open were milled out. This isn't it because I've cleaned it up w/ a hole deburring tool. Does anyone have any suggestions or cures? TIA.

Binding???  You can try tapping the mag as you load to re-seat the round..... (it's early, maybe I don't fully undersand the question...)

I forgot to mention that.  That was the only way I could get it loaded.  But it's an awful pain in the ass to do it every 2-3 rounds which is what is required to get it loaded.  This doesn't happen w/ any of the 25rd mags I have.  I don't think the capacity of the mag has much to do with it, since the binding starts after about the 3rd or 4th round is inserted.