I was at the hardware store and bought 3 different length 8-32 machine screws and a handful of nuts.

The longest one and 10 nuts later, I have a 255 grain head that screws in nicely and smacks the snot out of my box target

LOL! I was wondering how your nuts-n-bolts experiment was going.

$.60 total cost at the high priced hardware store.

Head of screw is slot cut with a bit of phillips. Wonder what it will do to a squirrel...