grouse.....got an even better head.
357 case, hit the rim with a file to even it with the case, slide a large rubber blunt over it.
you know have what we call...'the wrecking ball'. Its heck on grouse!!!! No need for the casing for hares. For birds it stops them where they stand!
Its the ONLY head (and I've shot most of those pictured and a host of other home made concoctions) that I have NOT lost birds with!
they're also heck on trees or anything else behind said bird when you miss! truly an amazing grouse head!