Been working with the Lyman #225438 in the CZ .22 Hornet for a good squirrel load. Cast from ACWW+ 2% tin, and 6 gr 2400, it takes a squirrels head off. I did use the Lyman gas-check seater and a flat top punch to put a small flat meplat on my hunting boolits in the Lyman 450 sizer. It is a little too destructive for body hits, but great for headshots.
I was surprised at how "nasty" this little boolit performed!