I got to thinking about this after my latest range trip. I brought the new P320-M17 to the indoor range on Sunday to put a box of 50 through it just to verify function. I forgot that I had used up my supply of Federal American Eagle 115gr bulk ammo, so I grabbed an old box of Remington Golden Saber 147gr that had been sitting in the back of the safe. Of course the pistol ate it up with no malfunctions whatsoever. Now, I've had guns that were filthy after just one 50rd box of range ammo, and some that showed some residue, but I was very surprised that the M17 didn't even look like it had been fired. There was practically zero residue anywhere, even inside the barrel. I know it was just 50 rounds, but I've never seen a gun look this clean even after putting just one box through it. Apparently the Remington GS uses a very clean powder. I would expect that most manufacturers would use cleaner burning propellants for defensive loads, but this was surprising to me. What are some other factory loads that burn clean, specifically practice/range ammo?