My 300 wsm shoots 165 gr speer spbt at 3250, no jacking the speed there. 180 gr at 3000. I've never owned a seven mil, but have shot the O'Connor for a few yrs.
60inch long, 50 lb draw but doubt your son will pull 50 lb, or even you, and if you can it's likely to do some damage to your shoulder. As previously said go to an archery shop.
Cheap arrows, you'll break a few to start with. Go to google there's tons of instructional vids, and get your elbow up high, otherwise lots of pain in the shoulder, and a little often is better than a lot all at once.
Welcome to the trad crew
I have two browning's,one is the long range and it's damn good apart of the trigger, just too heavy for accurate shooting for me. I need something light.
Less tha12 months ago I picked up a win mod 70, it has an easy to adjust trigger pull and it's the one that's going into the coffin with me...