Agree on the preparation. But you can prepare with a 22 long rifle.
Ballistic coefficient, twist rate, cartridge length, seating depth and all that jazz don't matter at all with a youngster shooting game within 200 yards.
Agree with your statement, but disagree that those are necessary constraints for all young shooters/hunters. Sure, they can practice with a .22 and limit their shots to 200 yards, but they can also practice and prepare with CF rifles, get involved in local PRS-style matches, etc., as they are getting into hunting. I've seen a young boy that did exactly that take his first deer at 70 meters from a solid rest. The next day he took his second deer at 355 meters, with some wind, from a standing position while holding the rifle against the side of a straw bale; a position that he had practiced a bunch and used successfully in PRS-style matches, in the wind, out to 500 meters. It doesn't hurt that he was set up with a rifle/scope/bullet/load combination that he can use in practice/competition as well as on game.
If the young person is prepared and practiced with a rifle, they can be capable of taking advantage of slippery bullets where BC, twist rate, mag length, etc., does matter.
