Well the .20 has some of the benifits of the .177, faster, flater tracetery and has its a bit hevier the shock effect of the .22. i use all calibres myself from .177 up to .25, the .20 I have are a Sheridan Silver Streak pump up and a Bsa Fireberd pcp rebarelled with a walther .20 barell. I dont hunt but the .20 H&N F&TT hit the target with plenty of power. Which is best, well thats an old. old arguement and I am not going to get involveded in