Just one more gimmick. The whole point would be to act like a hollow point, but the Crosman pellets are a fairly hard alloy of lead, and don't mushroom well even if you can hit the target. I use the Crosman Premier Dome Hollow Points for chrony and other work where you are just burning through pellets but accuracy doesn't really matter.
Retuning my Marauder and burned about 700 rounds, still burning (made some mistakes in the process, so back to the adjustments). If you can get Piranha's really cheap, they could serve a purpose, but Premier Dome hollow points are only $6.50 at Wally world. Hard to beat that price these days.