My R9 fires the 124 Gold Dot and 115 Silver Tip ammo just fine. But I wanted to see how some of the Federal Syntech (coated bullets) would fire, just for fun and a leaning experience.
First I fired 6 rounds of Federal Syntech Action Pistol, 150 Grain at 15 feet (indoor range). All rounds hit but all rounds "keyholed" into the target. No problems with feeding. (Note: this round shoot exceptionally well in a S&W Target Pistol with reduced recoil and excellent accuracy.)
Next I fired 5 rounds of Federal Syntech Range 124 Grain at 15 feet (indoor range). All rounds hit and went straight and true into the target. No problems feeding.
Since I did not encounter any feeding issue, I intend to purchase the Federal Syntech Personal Defense rounds (124 grain) and give them a try when I get a chance.