I've checked the threads on multiple forums, and outside of maybe one brand.....I "think" supers are good to go in a D60.

Has anyone had any problems?  I've seen a couple of YouTube videos that shows them working, but I'm curious to know if anyone has had anything NOT work?

60 rounds of 110gr V-Max sounds awesome.....and HEAVY....

Bumping this since I have the same Qs. Tried doing this in a Surefire 100 and it crapped the bed

Well of course it crapped the bed; it's a Surefire magazine. Those don't work period.

Been tempted to try some 125 gr. supers in mine BUT if it jams it looks like a big PITA to clear.

Personally I'm thinking of trying .300bo in that new German 60 round quad stack mag that ATI is importing.

I've been using one for a couple weeks now for daily practice/drills in my .300 BLK MCX; here are my findings:

Barnes 110gr VOR-TX: Loads 61 rounds and still seats on a closed bolt, no issues cycling or manually unloading.

MagTech 123gr FMJ: Loads 61 rounds and works perfectly just like the Barnes.

S&B 200gr subsonic: Loads 3-4 rounds before binding up and it's a real bitch to clear; don't use subs in these due to internal geometry interfering with the fat bullet design.