Been toying with doing this a while now. Was going to begin working with a Savage 219 in .22 Hornet to do this, but have recently picked up a Mossberg MVP Predator in .223 and kind of think it may be easier to get good results from and would make a better hunting rifle.
I have the Lyman 225415 and 225438 molds and quite a few different kinds of pistol powders. Most of the cast load data I see for the .223 is for velocities a lot higher than a .22 LR. The latest Handloader magazine I have has an article on just this topic and they recommend the 225438 and four grains of blue Dot for 1100ish FPS.
Anyone have a recommended load? I really want the accuracy and terminal performance of a .22 LR in squirrels and such if I can.