Hi,
I've had very good success with judo points. I know they're a bit expensive, but I don't lose many (only a couple a year). Every squirrel, rabbit, or grouse I've shot has been dead. I have had some bad luck, like the other folks here, with blunts. I've used the .38 shell casing, but not with the nail in the end. If you want to make a cheap home made judo point, mount a .38 casing and drill 2 holes perpendicular to the shaft in a drill press, and then pound nails throught he holes , so they stick out sideways.