I've been reloading since February. Some of my .45ACP brass has been reloaded four or five times. The rim is starting to look "worn out" but still functions perfectly. Should this be a concern? I've heard of some guys who say that you can only reload a case a few times; others say they have been reloading the same brass for 20 years. My loads are very light 4.6 of 231 for a 200g swc.