OK my take on this a pump may be fine but he will probably spend more time concentrating working the action and not swinging on the birds a 20g double would be great but finding one for 300 will be a misson so for the money a 12g mediem weight sxs most likly a 30 year old spainish gun no real collector value so cut the stock down to fit (most important that it fits )and keep the cut off and add it back when it becomes to short for him dont load him up with heavy loads 30 32gram loads will be fine and get him used to judging distances.I like youngsters to start out with doubles a broken open gun is a safe gun ,most of these guns will be choked 1/2 and full and scince this is going to be a learners gun i would knock a couple of inches off the barrels not worth paying someone to bore out a 300 shottie he will have more success with the open chokes and will be fine for steel and again get him to judge distances now remember this is a cheap learners gun and i wouldnt do this to a good b gun etc but the gun will get used and knocked around a bit and its a stepping stone so no tears when bangs and dings happen
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