Ok here's my 2 cents. I think a lot of daddys and granddaddys that have been shooting for years get used to recoil, have been around the muzzel blast, yadda, yadda, till it don't bother them anymore. To them there is no reason to start with a "mild" shooting rifle. Recoil and muzzel blast are both bothersome to some people. I think the worst thing you can do is start a 13 year old off with something begger than a 243 Win. I would get him used to a 22 RF first, get him interested in shooting in general, then go to a 223, borrow one if you have to. Then get the 243. Teach him to shoot good, where to place the bullet. A 243 in hands of a good shot will take anything from big mulies down and do it in fine form. Don't make any difference what you are shooting, 338 Mag even, hit the animal in the wrong place and you have a long tracking job to do. Get the 243 in the standard 22" barrel and don't look back.