The barrel diameter and countour on the 20" youth is well below that of the normal 22" ... And Tim stop me if it has changed , the 20" barrel is a 1 in 12 twist rate while the normal 22" standard countour is a 1 in 9 twist .. This can limit just how heavy you can go with the wt. of the projectile or how lite of a bullet you can use ..
My 22" 223 bull barrel loves 60,68,69 &75 gr bullets ( 1 in 9 ) My Ruger Target Grey 223 bolt rifle ( 1 in 12 ) doesnt like but a few 55 gr bullets , and preffers the lighter ones on average.
Hope this helps you out a little ,
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