As everyone said... no problem. .30-30 brass is pretty thin. The one place you will need to pay attention is when (or if) you crimp bullets into those cases. As I mentioned, .30-30 cases are pretty thin, particularly around the neck. I've crushed more .30-30 brass than probably any other cartridge case... go easy, young man!
Assuming they are for a tubular magazine on a lever-action, you will need to crimp. Make sure all the cases are trimmed to the same length, or, barring that, just don't go heavy on the crimp. If memory serves, I have a taper crimp die specifically for the .30-30...