The difference you're seeing between the semi and revolver with the same ammo is most likely due to the harder strike of the SA revolver hammer on the firing pin.
Harder hits = more reliable ignition.
As a reloader, I can tell you that most Rem brass is harder than other brands. Their primers use harder metal in them, too. If you have a firearm that has a light strike, Rem primers are not usually a good choice.
Remington brass is not usually a top choice among handloaders for that reason. Hard brass doesn't move/stretch well without splitting, so it doesn't have the longevity of some other brands. My choice, in order of preference, is usually Starline, Federal, Winchester, and then Remington.
I would imagine that this same tendency (harder brass) carries over into their rimfire ammo, too. If that's the case, then harder firing pin strikes would almost certainly give better ignition. Better ignition would likely burn the powder better too, perhaps leaving the gun a bit cleaner.
FWIW,
Daryl