I cant speak for a smokeless application but i have used them in two 45cals using BH209. One in a Knight Elite 45 and the other is a Accura 45.
They are very accurate in both and have a long bearing surface. The bearing surface is longer than any 180gr JHP ive seen and as long or longer than 200gr JHP 40s.
I was pushing them to over 2250fps with great accuracy but they would lose all the petals on impact with my test media (totally soaked phone books, particle board and a water jug". They did retain 140gr with all petals gone at about 15-20yards.
Running them through a ballistics calculator shows that at about 120yard they still have well over 800FPE and shoot very flat with a 2300fps muzzle velocity.
Performance on deer sized game is debatable but as a youth load, IMO i think they would work well depending on the distance to impact.