WPA is polymer coated. Golden Tiger is lacquer coated. Both do well in my Saiga, but after 3 or 4 mags at the range and the gun gets hot I get like an oily film on my glasses with the Golden Tiger. I don’t know if it is heated lacquer blowing out or some very fine lube on the cases.
I ran several thousand rounds of WPA in my RRA AR15 with nary a problem and then I got this one jam with the case in the chamber that was *very* difficult to get out. Since brass cased ammo had come back down in price I sold the rest of the steel.
I haven’t fired Wolf ammo in about 15 years, and I know back then that it gummed up the Bushmaster.
As for Tula ammo, it’s cheap, in every respect. My guns just don’t get along with those steel casings.