I have been playing with a howa mini 6 arc, with stockys stock. With scope it is a little over 5 pounds. Have not had my kids shoot it with the 108eldm, and probably wont. No question it will be too much recoil for them I honestly dont like shooting it much with those loads.
Hopefully with a heavier scope it will settle down some, current scope is about 12oz. Maybe add some weight to it also?
Had them (70ish pound girls) shoot some light vmax loads through it, none of them complained, but chose to go back to the 223 to shoot more. Surprising how much even the 223 moves them. But they run the bolt and ask for more when the mag is empty so it must be ok....