i have shot quarry at 55+yrds but its pushing it for shot placement only to be done under ideal circumstances the penatration is there aslong as you get the soft spots but crows i would suggest no futher than 40yrd there tough old birds
will sort some out but there,s plenty on the internet just google honda 5.5kw genny its the frame mounted type oh and been watching a few go on the bay a bit cheaper so 250 ono