I cannot imagine holding the 40 round .45 drum! Lotta weight there. I’ve got a couple of 18 round Browning Hi Power model extended mags, but don’t have a Hi-Power anymore.
I think you would forget about the weight real quick if you had, say, oh, I dunno, like maybe, A HOARD OF COMMUNIST BEARS BREATHING DOWN YOUR NECK!
I know I would. ;)