gunk in brass a problem?
I started reloading a large batch of 30-06 and while doing so I noticed that the is a small layer of "gunk" inside the case. I had lubed them up for full length sizing and then tumbled them in some old dusty walnut media. The gunk does not seem to be damp at all but rather caked on walnut dust. My question is, does this pose a threat to long term storage life?
My Calibers- 9mm, .38spl, .357 mag, .45 acp, 30/06, 303 brit, 7.7 jap, 7.5 french.