HiCap:
I've fired one magazine of Golden Sabers without problems. The other premium rounds I've tried, the recommended Speer GDHP (in 115, 124 & 147 grain), & Federal HydraShok 124 grain, worked fine. I'm sticking with the Speer GDHP in 115 gr. for carry.
UMC practice ammo in 124 gr. FMJ has given me some problems. Feeding was fine, but the primers seemed very hard. First time thru, I got only shiny spots on two rounds. Recycled them about 20 (nervous) minutes later. They both fired. I'll use the balance up in practice and switch to another brand like the Winchester White Box rounds you fired.