boat tail bullet

[kokomokid]

I saw this post about the boat tail paper patch bullet and reminded me of when I used flour with a 405gr GG 45cal bullet to keep the wad from going up into the base. This was going to be my chicken bullet. I improved it somewhat but it was never going to kill chickens.
I know you probably put a lot of effort into this bullet and curious as to how far down you patched and alloy used? Some people were saying how great the boat tail would work on a subsonic bullet but I never saw the results?Did you ever try it with a nose other than hollow point?