Maybe it is that my tumbler holds more than yours. I have a Frankford and it uses about 3 lbs. of media to get the proper movement of cases and media. A 5lb. jug of untreated corn cob has lasted me thru about 2000 cases of .223 rem, 1000ish 9mm, and 235 of .380. It's still getting them clean in about 3-4 hours. But then my clean and your clean could and is most likely different. BUT, I am willing to try new things and if I can save a dollar.... So thanks for the heads up on the time span of the wally world media. I'll give it a try and see how it does for me.

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15T,15-22,5946 & some not S&W