20g 870 in a youth stock.
It will serve him the rest of his life. Can be restocked if needed. 410 is not a beginner's gun by any means, and if you want to go waterfowling is a complete non-starter
When the old man was around, I talked to him about getting a 20 gauge to teach a girl I was dating to shoot and he reminded me that I was shooting the 12 gauge since I was a kid and I wasn’t a big guy.
410 is just fine for grouse, but he’ll need at least a 20 when he starts wanting to hunt other things. Guns are heavy, you can give him a 22 lr for grouse (at least in BC) and walk with him while carrying the 12 gauge and then let him try the 12 when you come across grouse too.
Standing so he can sway and holding the shotgun tight for the recoil and I’m sure he can fire the 12, but maybe not carry it all day.
It won’t take many years to get stronger ... think of the teens carrying heavy Enfields and Mausers in WWII
My son turns 13 here in a two months, he has been working on the online Hunter Safety course and he is ready to write the test and do his PAL course. I want to get him a shotgun of some kind for the fall. I hunt grouse, ducks and geese mostly and I just use my Browning BPS for all that, it works great. Unfortunately my son is very small for his age, he weighs just 80lbs and is quite short. Besides the gun being way to big for him, I think 3" BB shells would put him on his butt in a hurry. I was thinking about a gun to use just when we are grouse hunting, so it would have to be light enough he can carry it all day as I sometimes cover 15-18kms a day walking when I hunt grouse. Kind of in the dark on this one, being a big guy, I mostly have experience with 12 gauge guns, never really played with 20G or 410 too much. Used to have a 410 for grouse, but the 12 gauge is a better gun for a do all kind of gun. Any suggestions on a smaller, lighter gun that won't beat him up too bad? For budget I would say $700 max.
Semi-auto - just not a good idea for an inexperienced shooter - nothing to do with age - my Dad was the worst - 50 or more years of shooting single shots and bolt actions, he was convinced that the safest gun was one that had just been fired - he was damn DANGEROUS to be around at the range with my semi-auto's, and could not be convinced that his way of thinking was "wrong".



























