.20 will be placed in the same class as .177, it has a more more luppy trajectory and also the pellets are harder to come by and you have less choice.
.20 in my opinion is the worst of both worlds and has no practicable use in HFT.
Somehow I made TEAM ENGLAND 2012 and 2013
Illiterate writer for AirGunner
The real Kung Foo Panda.