My son started with an 870 and light loads .
I always recommend making sure the gun fits, that the loads for starting are compatible to the person being able to handle them, and a good recoil pad.
I've seen lots of people complaining about their semis kicking the crap out of them, and this was because they were shooting loads to heavy for them to handle, no recoil pads, and poorly fitting guns.
Over decoys, a heavy field loads in not needed, what IS needed is a well placed shot charge.
I've done some of my best shooting over decoys with 3/4 and 1oz loads of steel in a 20 gauge with 26" barrels in a light recoiling gun that fits me.
Cat
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Anytime I figure I've got this long range thing figured out, I just strap into the sling and irons and remind myself that I don't! 
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