I did both mods today.
Before working on the feed ramp you can see where the copper marks were hitting.
After working the area with a Dremel.
I believe it's because the magazine is not seating far enough. In this pic you can see the gap from the magazine feed lips to the receiver.
I also dremeled the inside of the Tapco 20 round magazine feed lips.
I did show the problem to a gunsmith today after the rifle FTF (but before doing this work in the pictures or on the magazines). He said that the back of the magazine has the gap, but at the front (the pivot point) there is no gap so he would dremel the feed ramp and charge me $50. I didn't want to wait a month so I did it myself.
I cycled a magazine of FMJs through and they all fed. Then I cycled 5 hollow points and they all fed. But then I saw the tips on the Hps,, they were all dented,,,,,, ****.
I figure I can dremel the feed ramp some or,,,,,,,???? Anybody have any other suggestions?