Why not just shoot factory ammo?
Your granddaughter probably doesn't possess the shooting skills that are desirable for long range hunting, so a little more velocity and a higher BC isn't likely to add much practical value to the equation. If you feel a pressing need to shoot pointed bullets, you could always shoot Hornady's 140 or 160 grain LeverEvolution factory loads.
If you have a Savage 340, I highly recommend the B-Square side-mount, as it is hands down the best scope mount for that series of rifles that I've seen. CDNN is selling them for $15, up from $10 not too long ago.
