As long as the case didnt spend time face down in the mud you will be fine. Ive loaded 20K+ of .40 without doing anything other than tumbling and running them through the press. Tumbling the brass does make it easier on your dies, but its nothing that I would be to concerned about. But Im also kind of a rebel like that.
Loaded for 20+ years without ever tumbling a case, could always tell which ones were mine and which were range pickups, mine were a delightful black color and always worked just fine.
If you do use a liquid tumbler, here is a cheap solution to really clean your brass. 1/2 gallon hot water, about a teaspoon of dish soap and 1/3 cup of white vinegar. Makes black cases look new again and cleans both inside and out.
If you do use a liquid tumbler, here is a cheap solution to really clean your brass. 1/2 gallon hot water, about a teaspoon of dish soap and 1/3 cup of white vinegar. Makes black cases look new again and cleans both inside and out.