I purchased a bulk pack of the improved GB at Wally World, the 225 round bulk box , I was not holding out much hope for them, as I have had horrible results with them in the past (the older 550 round bulk packs)
I have around 60 rounds left over, and so far they've all functioned 100% in multiple guns, a CZ 452 Ultralux and Scout, a Marlin 39A, and an Ithaca 49, all fired on the first strike, no duds, and muzzle report seems consistent, the bullet seems to hit my spinner target with authority as well
IME, the new Goldens do actually appear to be improved, the only issue I can find with this box was a high number of loose/spinnable bullets, out of the 225, roughly 40 had tight bullets that would not spin, or grudgingly spun