I carry it in my full size 1911, haven't had a chance to use it on an animal yet. Informal shooting at large rocks and small rocks on soft mud banks and misc other media, it appears to open up as advertised with the rubber plug in the nose but holds together well due to the harder core than in the critical defense line. Personally I wouldn't be afraid to use it on deer or medium sized pigs at normal 1911 type ranges, a good man knows his limitations, use accordingly and I think you won't be disappointed.
-Eric-