If you compare base dia of the 303s to a 30-30 you will see the 30-30 is only 3 thou or so smaller. It is not safe to do repeated reloads useing 30-30 cases, but for yrs now I have used plentiful 30-30 pick-up brass for hunting. Simply run it thru the 30-30 die, trim & load. I load close to max & discard once fired brass. Actually I prefer to step on them or crush them if I can find them after shooting.
Of course for litigation sake I would strongly recommend you not do this![]()