I'm not new to firearms... I've owned multiple guns since 1977, which doesn't mean didley.
I am VERY confident at my ability to be very accurate hitting a paper target between 4 and 25 yards, standing in a lane at my indoor range with one of my firearms... I've done it about once a month for the past 4 years with 12 range buddies.
However, I have shot over 30 different firearms at two different ranges with my range buddies' firearm. It's interesting that I can pick up a pistol I've never touched and shoot it very accurately. I can pick up a different pistol I've never touched and can't hit my POA to save my butt. And... I've witnessed my range buddies, who are REALLY good shooters, do the exact same thing. Why?
I have spent several hours very carefully sighing in a red dot. I feel from a couple hundred rounds that I've got it sighted in very accurately. During the next range day, I asked one of range buddies (who has picked up one of my pistols that he's never shot before and shoot 10 rounds more accurately than I ever did!) to try my new red dot to get their opinion. They shoot a couple mags and then tell me "I think it's shooting a little low." I can show them the target I just put 2 mags through at the same distance 15 minutes before. How does that happen?
Is this a real phenomenon or is it just a Twilight Zone event?