All the Laser Cast bullets I have tried ended up leading the bore. Melting out the lube they came with and re-applying my own lube fixes them, as does a coating of tumble lube.
They are plenty hard, even more than required, for what you are doing.
You might want to slug the bore in that #3 and see exactly how big it is. The one I used to have needed .461" bullets to work properly.