I recently moved my RMR to my carry pistol and installed a Fastfire III on the CORE, After sighting it in at the indoor range I decided to see if it worked at a slightly longer distance. After I finished getting a little practice in with the six shooters. It was around 85 degrees and my glasses were starting to fog over but on all the shots that I managed to get the dot on the plate the bullet managed to touch it. On the strings where I shot a more reasonable pace they all managed to connect. I am ready for fall.
Congrats! I have the same setup. I've had mine for about 2 weeks now and love it. I did add a LF Arms extended mag release. I have short fat fingers and it makes a real difference for me. Nice range you have.