I haven't fired any Remington Golden Sabers. Just Gold Dot and Federal HydraShok.
Took a look at the specs, though. The Golden Saber 124 grain is listed at 1,125 ft/sec vs. 1,150 ft/sec for the GDHP. (The Federal load is listed at 1,120 ft/sec.) Knock off bout 30 ft/sec for the short barrel of the R9.
I'm sure all the 9mm standard pressure loads are safely within SAAMI specs. Of course, the muzzle velocity figures don't tell you what the pressure curves look like, and that is a big factor in forces on the slide.
Sure hope the Rohrbaugh factory gets to the bottom of this quickly.