JC, can you get any more powder in there? The 35 Rem looked to max out at about 12 grains. I haven't tried a 30-30 case, but I would think that you should be able to stuff a little more in there.
Hammerhead will probably have some suggestions.
Good point on the school thing. It's a sad world these days
When I went to HS (which wasn't that long ago, 20 years) kids had their guns hanging on racks in their pickups so they could go hunting after school. That would get you locked up real quick now days.