Thanks for the post. All great thoughts on the subject. I don't see any brass or GM big wig wanting to upgrade an M-60! We could field an urban terrain (light tank) vehicle that wouldn't lessen the M1 tank killer role.
Any takers to what caliber that tungsten shot is?
If it were a 12 Ga. I would say it was #9 shot.
However, counting about a dozen across, is that 120mm?, I'd say about 10mm.