Based on your situation, I'd suggest staying with a 7-08. You are set up to reload for it and you already know it works. Since you reload, I'd suggest keeping brass separated for each rifle - every chamber is a little bit different. Putting a different color line across the head of the case using a Sharpie marker is an easy way to tell which case goes with which rifle. Each kid gets to pick their color...
My youngest grandson has a Savage 110 Storm in 7-08 that shoots lights out...
My youngest grandson has a Savage 110 Storm in 7-08 that shoots lights out...