My son shoots 80 grains of BH209 with a 250 grain Barnes all copper bullet and it is very lethal at the ranges he shoots. His furthest shot last year was 105 yards (which is his limit) on a doe. She dropped in her tracks from a spine shot and the bullet traveled the length of her body and lodged in her hip. The other two deer he took were pass throughs. If your sons shots are limited to 50 yards, I would say it should get the job done but any further, you may want to up the charge some.