My Covert eats GD124 and Federal HTC 124 without a single hiccup. It also seems to do fine with Lawman 115 for practice (just what I have available) and has had no problems with the few 147's that I have had in the past. I will stick with the 124 in GD or HTC. My other R9 is presently in a gunsafe in Florida, but when last tested (new to me and not shot much) it was happy with Lawman 124 without a problem.
Find out what your pistol likes; use it! TREAT IT RIGHT, HOLD IT TIGHT, CARRY LIGHT.