Just got back into shooting after a 3 year hiatus and didn't want to dip into my stockpile of ammo. When I started shooting my CZ-457 LUX, I broke it in with Golden Bullets and they performed well. I just bought a couple of boxes of the value pack, and boy I couldn't believe the quality. Some bullets had gauges. One was so badly deformed I wouldn't load it. When I shot them, there was no consistency. Some had a moderately loud crack, some a moderate crack and too many a soft crack, as they left the barrel. And I couldn't believe the flyers. Don't know if I had a bad box, or what.
This morning it was so bad, I dug around in my ammo box and found the same bullet ( 36 grain, 1280 fps, HP, copper plated) by Winchester. The difference was remarkable. Each shot was consistent, with a sharp crack, more than GB, and pretty much went where I was holding.
I'll be using up the GB just to get my body back into shooting shape, but when I'm ready to start shooting for precision, I don't know.
(edit) Oh yeh, I've used Thunderbolts in the past. Liked them. Will have to try them again.