If your 700 Youth .243 is like the one I bought for my son, Winchester 100 grain, Federal Blue box 100gr and Fusion Ammo 95 grainers will all shoot well enough that there is no need to re-load for it. We settled on the Fusion Ammo and have had very good luck with it.
Not sure how old your kids are or their tolerance for recoil, but mine was young and only about 35 lbs when he started hunting. I took the recoil pad off and filled the rifle butt with BB's then screwed the pad back on. If you get enough in there they don't move around too much and the noise is minimal. It takes what little sting a .243 has completely out.
Bob.
