Just got back from the range. Here are the results.
I shot 2- D60 drums 2X each - 240 rounds ran flawlessly.
The 150 rd Armatac 1X drum was flawless. A Sheriff wanted to take video
#1 KCI 100 rd drum was flawless.
#2 KCI 100 rd drum failed to feed rounds up the mag body 10+ times. It eventually stopped with about 64 rounds in it. I will need to disassemble it to fix the left column of dummy rounds that fell out.
4- 30 rd box mags ran flawlessly.
The KCI drums were also very easy to load with the Magpump. I just unpinned the handle on the Magpump, rotated it 180 degrees and pinned it back. Then inserted the drum and pulled up on the handle for each round. Easy peesy.
I really like the D60 mags. They are not that hard to load, although more difficult than any other drum I've loaded. 2- D60 drums fit in a .30 cal ammo can for storage. I may keep the 2 from Brownells if they ever make it out of the BRASELTON, GA FedEx location.
I would pay $80 for additional D60 mags if anyone does not want theirs.