I was (still am to a certain extent) a geek, and “outdoor life,” including the various hunting seasons, (bow, black powder, and long gun seasons) were all part-and-parcel of our group. We also did camping/hiking/back-packing, canoeing, rock climbing, etc. In fact, I’d say that it made us better role-players in D&D.
Like, you knew what a Ranger could and couldn’t do w/a bow-and-arrow, how long it took to reload a crossbow, how Moving Silently really worked, how much Encumbrance really affected overland travel, and how terrain types did same, etc.
We didn’t have LRP or SCA to practice edged weapon martial arts, but we did have free Taekwondo classes at our city’s Youth Rec Center, which we all gladly participated in.
For a bunch of nerdy geeks who liked to spend time in the computer lab at school, who took Chemistry, Physics, Algebra I & II, Trig, Intro Calculus, etc., and would spend a Friday night playing P&P D&D, Gamma World, Traveller, rolling dice, eating pizza, etc., we were in pretty decent shape, and could handle ourselves when some jock d-bag decided he was going to thump on some nerds. When word got out that we owned* and were proficient with firearms, and hunted, the harassment level from “the cool kids” dropped considerably.
*This was waaay pre-Columbine, by 15 years +/-. We didn’t literally “own” any firearms at that age; they were technically our parent’s guns, typically our Dad’s. But they were “our” guns, rifles and shotguns, inasmuch as we were responsible for them, kept them clean and well maintained, and used them when we went out hunting. When we turned 18, and could legally own said long guns, then they literally did become our guns.
To the OP: not much for me to add to what’s already been said; sounds like you got a good kid, let him have some fun with it for now. If he “dives in” so hard that his grades start falling off, or he starts withdrawing socially, then you should step in as a parent and get him to pull back a bit and re-engage.