Inside 30 Yards,....forget expansion. If the shot is placed well, you could hit them with a cheapo crosman copper-head 'pointed pellet', and get the desired results (OK, That may be stretching it a bit?!?!?!?) . You've got the juice Johnny, let them rip. I've shot a squirrel at 25 yards with a Diana 34,... not much expansion,...yet they got the kill, and the critter's in the freezer for "crock-pot" season. Cro's and Pred's are great!! Preds are boarder line for springers, and Cro's are best left to .177 cals ( way too heavy for .22 springers!!! as per CDT,... PCP's/Pumpers only)....but the Discos (CPHP's) will "git er done"!! Trust me, the Disco Pell's are as good as they get!!! tjk