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At 20#/19" only about 6 ft-lbs KE is generated and isn't really suitable even for rabbits. You'll need an arrow with a very weak spine, about 3.0", almost a limp noodle and not very durable for proper spine, so going stiffer in spine isn't a bad idea as long as the overall weight doesn't slow the bow too much. I'd recommend cutting the shaft no shorter than about 1" beyond the riser, and recommend 23", that provides a bit of safety and room to grow. If the boy's DL increases beyond 22", and he likes archery, he'll be needing new arrows anyway...maybe even a new bow. The Jazz XX75 1214, 2.5" spine, with 45-gr bullet point and G-nock is about the closest fit @ about 115 fps. Also the Jazz 1413 with 35-gr bullet point and 7/32" glue-on nock works at about the same speed. I like the Jazz 1214 because it has a better FOC and a direct fit instead of a glue on nock. You'd have to go to at least a 1716 to get an RPS insert and screw in points, which would be very heavy at 9 gpi, and only about 90 fps (a slow softball pitch speed), and not much distance. I like aluminum shafts for youth arrows because they are durable and eliminate the worry about cracks, splits, slivers, etc. Aluminum in the small sizes doesn't weigh much more than expensive carbon target shafts and lighter than most youth carbon shafts (1214&1413 are 5.9 gpi, Easton Carbon One 1150 are 5 gpi, Beman ICS Hunter Jr are 7.9 gpi). Aluminum will get bent, but they can be acceptably hand straightened. The G-nock is a direct fit and easily changed out. And, they are about the same cost as Youth Carbon shafts, around $56/dz for finished arrows. At only 6 ft-lbs KE a small game blunt for rabbits is out of the question, unless you want to just bounce it off of them, and with a bullet target point there would be just too much squealing, kicking, and wounding ... might not be a good introduction to bowhunting.
... hopes this helps. PS - with the ultra-slow youth bows, I don't burden them with the extra weight of No-Glove fingers. A simple finger tab or glove doesn't unnecessarily slow the bow. It is hard to find a release aide that fits a youth, and it takes extra coordination that some have not yet acquired, but can be good training for later on. TruFire makes some 'kid-sized' releases. http://www.trufire.com/juniors.html
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