hmm about a half inch to three quarts an inch from 13-15 yards out to 60 yard...with the right pellet in, yu dont need the extra from a .22 lol. suttlety prevails
bare in mind though, as you get used to stuff, a heavey pellet carries a lot further..and holds a bit better (in fac turms..).
I would worry about how a little .177 would behave with 30+ft/lb of power behind it.... but i'm now of the firm opinion that its the best calibre for sub 12.i think at 30fps it would be aproaching the second sonic barrier with an 8.4 grain pellet..
a little less would mean more shots per fill of cour