By the way, only loading five makes keeping the ammo in the box easy to keep track of.
I always only load 5 in a Colt with the hammer down on an empty chamber, whether messing around at the range or competing in CAS. And yes, the Ruger guys have to only load 5 too, so they do not have a competitive advantage.
Since my ammo boxes have 10 rows of five, it helps me stay organized.
P.S. Don't tell anybody, but I usually only load 5 in a modern S&W revolver, which is completely safe to load up with 6 rounds, for the same reason.
To keep the ammo in the box organized.
Before anybody slams me, I do not carry, so it does not matter that I am only loading 5 into a modern six shot revolver at the range.