I think a young hunter is better off shooting a 20ga than anything smaller myself.One has to be a pretty good marksman to be able to hit game with .28ga and 64ga's. The smaller size shells mean less powder, fewer pellets mean more likely to miss or wound at any range, cause the hitting power won't be there, and fewer pellets
will be reaching the target carpared to a 20ga.I think the 20 ga combined with interchangable choke tubes is perfect for both upland and alot, not all, but alot of fowl hunting especially over decoys.
But yeah nothing wrong with the 20ga.