5/8" groups has been the worse group i can shoot out of the x-150 with my 80 grains RS and a 385 GP conical. 5/8" is what i have been getting ever since i found this load. 1/2" was the best but that only happened once. I get disapointed if i dont shoot atleast a 5/8 or 7/8" group out of the x-150. I can easily expect and see a 1" group with a 295 powerbelt a 120grains loose RS. Lots of time invested finding these loads. Now its time to go shoot the .45 and dial in my final load that i will use.