Before pellets, Pyrodex,Triple7, BH209, White Hots,Clean Shot, American Pioner and all the other subs. A good load was considered 1 grain equal to the caliber of your barrel. 32 for .32, 36 for 36, 45 for 45, 50 for fifty and so on. Now somewhere down the line Magnumitus set in threw the use of Propaganda by the marketing wizards of the day. Now you need the latest and greatest gadget and 2 pellets minimum to even start to kill any creature on Earth. At one time the NYS record deer had been harvested with a 25/20 , yes 60 grain pill and 20 gr of Black powder. The 34/40 and 44/40 were considered the kings of deer and Man killen machines. How is it today that a 240 grain bullet driven by 50 gr. of a substitute gets questioned for hunting out to 50 yards. This load you question is stronger IMHO than the 44/40 ever was, simple 10 more grains of powder,same basic weight of projectile.

You just need to make a hole to let blood out and air in, it is really very simple.

IMHO, Your questioned load will do a fine job, Let the kids practice and enjoy the hunt.

Ken