52 sighting and shooting different

Got my 52 fitted with a red dot, and, to check the red dot,  Shot a few at 10 yds for setting check in a plastic rest by Caldwell the range has.  All went in one hole!
then tried the previous posting's recommended sighting in method: arms on bench wrist and hands up and above the bench. Results: high and left.  I was as careful as I can be with trigger pull, although it is very light-
I am thinking the difference is shooter error, but would welcome any advice to the contrary.
I spend probably 3hrs a week dry firing, not all with the 52.

What happens if you just stand up and shoot it?

I've shot my 52 on bags, Caldwell, 2-handed, and found the only thing that matters is how you shoot it one handed. Everything else is wasting ammo.
She is a sweet, but unforgiving mistress.

looks like one handed is the answer.   I don't shoot that nearly as well as 2.