I have owned an R9 for some time, my first one delivered around 2005 or 2006, it is incredible how time flies.
I have owned a Seecamp for about twenty years.
I load most of my semi-autos the same.
I start from an empty pistol and empty magazine.
I place one appropriate caliber round in the magazine, insert the magazine into the firearm, then rack the slide, I let it really slide home to seat the cartridge.Then I will do a press check to ensure the cartridge is indeed loaded into the chamber, I then holster the firearm, remove the magazine. The holstered firearm is safely holstered, trigger protected.
This I do all the time. I have read and heard horror stories how someone loads a firearm and gets distracted by the telephone or a spouse at the other end of the house, the firearm left behind loaded, unprotected from perhaps a young child in the house.
I load the magazine to capacity and insert into the firearm.
I guess if I had a slamfire using my method, and there was a potential of the firearm going full auto, there would only be that one round in the chamber. The possibility of a slam fire is not the reason I load my firearms this way.
This of course does not prevent a slamfire, but that is why as always, keep that muzzle in a safe direction.