I've not done an extended shooting session with the Golden Tiger. I have done it with the older lacquer cased Wolf ammo, shooting 1000 rounds in a relatively short period of time through a Colt M16A2. I've done that several times actually, and never had any problems.
The "gunk" that most people encounter is the same with polymer cased steel ammo. It's not the polymer or the lacquer (people claim both do it) building up in the chamber, it's carbon building up in the chamber. On steep case walls like the 7.62x39 and the relatively loose tolerances of the average AK's chamber, it's not a problem with the rifles. When shooting .223 out of a often times tightly chambered AR15 this carbon build up causes stuck cases. It's especially bad when you shoot say 1000 rounds of Wolf then run brass ammo through your rifle without cleaning the barrel/chamber. The carbon build-up in the chamber is attributed to the steel case not sealing against the chamber wall like brass thereby allowing propellant gases and carbon to pass by the casing.
I do have another case of the Golden Tiger coming and I will run a good number of rounds through my M16 on full-auto and get things nice and toasty and see how the Golden Tiger stacks up to the Wolf I've used in the past.