I have several chickens, and their coop is infested with mice. I transformed my flat headed lead pellets into sharp hunting pellets. Bbs and flat nosed pellets wouldn't always kill the mice with one shot ( they are fairly big), but these pellets almost always get the job done with a single shot. The materials needed are: -flat nosed pellets -small headed nails -wire cutters - super glue I am not reliable for any injuries or damage caused by these pellets.

Step 1: Cutting the Nails

Using the wire cutters, cut the nails right near the head. The wire cutters do not cut the nails evenly, so a sharp edge is left on the nail near the head. The picture with the pellet shows what the cut nail should look like (left). Make sure to keep the end of the nail with the head.
<p>just use heavier pellets it will literally punch through dog food cans at any angle the energy it carries will do the trick look for gamo's copper and black nickel coated pellets with a lead core those are amazing for energy dispersion and penetration</p>
<p>I have made these and I have found that from my pellet gun, a 760 Pumpmaster, in .177 caliber, I can get better penetration from just putting the pellet in backwards. even if it gets less fps, it only matters on how well the shot is placed and what the pellet ways, also, if you have a pellet traveling faster than 900 fps, it looses accuracy very fast and goes willy nilly, which is why I don't use it in my Stoeger 10x (shoots up to 1200 fps). Nice Instructable though.</p>
<p>I like the idea but wouldn`t it harm the rifling of the barrel?</p>
It's just me but I'd take less knock down and have a move accurate shot cause no matter how much knock down power you have its only worth anything if you can place it where you need it.
as far as ballistics go i can only see these decreasing accuracy and velocity. but i will give you the increased penetration, its just that if you want more damage\knockdown (for mice?) then use softer lead pellets or a hollow point for increased expansion