Yes to one...not yet to two.
The 152-millimeter shells made a powerful impression in a firefight, and M625 canister rounds loaded with thousands of flechettes devastated Viet Cong infantry in engagements in Tay Ninh and Bien Hoa. (from article)
I was in M60A2 tanks, same gun/missile system. Lots of weight for recoil, stabilized gun and power cupola independently stabilized from main gun and turret. The anti personnel round had “slugs” not flechettes. No range fuse on the round so basically a shotgun shell with a 60 degree arc and a 300m range.