As JSR are out off stock of Trophy's had a quick look to see who had stock, doesn't seem to be a scarcity of 20 cal in stock, which work in 90 percent of 20 cals (as everyone who has a 20 cal will confirm even when Superfield were an actual option, which never shot as tight or efficient generally)

The JSB go in a few better, and at FAC can be better, lots of them in stock too

Of course if you want to mess about all the time with different pellets ......or pay a lot for that certain Czech brand .....go figure