I built a bench rest for sighting in when I still had my fwb100.
https://goo.gl/photos/w6LetmycHe1kLN6E7
I put a beanbag under the grip when sighting in.. obviously as I had to remove the pistol to cock it, it wasn't perfect, still, using it, I could dial right in on the 10 and the pistol proved it could do one hole groups if I could (which I couldn't 😂! )

I made it from a board of ash and only took about an hour or so to make. The leather was from an old jacket.

You could make something like this to see which pellets are most accurate.

I used r10 and meisterkugeln but preffered the r10. Like Phatman pointed out - it's not a huge difference in cost per session and I just felt that I shot better with r10. Whether that was scientific or all in my head, nobody will know.

I would buy a few kinds and shoot shoot shoot... it will quickly become apparent what suits.