Lots of questions, and I have only a few answers.
You can shoot at least 10mm, 9x25, 357sig, 40S&W out of a g20. I am sure there are more, but these are the ones I have direct experience with.
I used my g20 10mm mags for all of them. No issues.
I used the same wolff aftermarket spring kit in all of them. The 357sig was getting a bit dodgy for the spring though. Probably too stiff.
I used KKM Barrels on mine. They worked fine and were no issue. I had to do some hand fitting though to get them in my g20. I use the KKM comped 10mm barrel still as my standard.
I can't answer the other questions on custom calibers or fittings. I did it myself.
Bottom line? I now just shoot 10mm in my g20.
9x25 was too abusive to my grip and was way too loud. It ws like holding a bat and hitting a brick wall with it.
40 short and weak was exactly that. Why waste a perfectly good 10mm bullet in a 40?
357 sig was interesting but I have a 229 sport that handles it better.
10mm KKM Comped 6" barrel was the best combination and all I shoot in the gun now.
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10mm and 357sig, the best things to come along since the 38 super!
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