It's time for another rock tumbling experiment. This time, I'll test various sizes of grit in both three and six pound barrels. Curious what the rocks from this experiment looked like when they were completely tumbled? Here's some red jasper that I was able to finish: https://youtube.com/shorts/M2Dv99UX77w This is fancy jasper that I tumbled several years ago. I didn't have time to finish the actual rocks from this video. They were taking longer than the red jasper: https://youtu.be/n0jXb4XoqHE If you'd like to read about more experiments on this topic, check these out: Science on Grit Size in a 12# Barrel: https://forum.rocktumblinghobby.com/thread/104749/science-on-grit-size-barrel Another 3# Experiment: https://forum.rocktumblinghobby.com/thread/104068/another-3-experiment Extra Coarse Rock Tumbler Grit—What You Need to Know: https://rocktumbler.com/grit/what-you-need-to-know-about-extra-coarse-grit/ RAW DATA (all measurements are in grams) Six Pound barrels: Week 1: 120/220: Start: 2181 End: 1997 Amt Lost: 184 Percent Lost: 8.4% 60/90: Start: 2180 End: 1976 Amt Lost: 204 Percent Lost: 9.4% 35/70: Start: 2182 End: 1981 Amt Lost: 201 Percent Lost: 9.2% Week 2: 120/220: Start: 2248 End: 2053 Amt Lost: 195 Percent Lost: 8.7% 60/90: Start: 2247 End: 2042 Amt Lost: 205 Percent Lost: 9.1% 35/70: Start: 2249 End: 2047 Amt Lost: 202 Percent Lost: 9.0% Week 3: 120/220: Start: 2466 End: 2269 Amt Lost: 197 Percent Lost: 8.0% 60/90: Start: 2464 End: 2249 Amt Lost: 215 Percent Lost: 8.7% 35/70: Start: 2467 End: 2249 Amt Lost: 218 Percent Lost: 8.8% Totals: 120/220: Start: 6895 End: 6319 Amt Lost: 576 Percent Lost: 8.4% 60/90: Start: 6891 End: 6267 Amt Lost: 624 Percent Lost: 9.1% 35/70: Start: 6898 End: 6277 Amt Lost: 621 Percent Lost: 9.0% Three Pound barrels: Week 1: 120/220: Start: 796 End: 727 Amt Lost: 69 Percent Lost: 8.7% 60/90: Start: 798 End: 718 Amt Lost: 80 Percent Lost: 10.0% 35/70: Start: 797 End: 728 Amt Lost: 69 Percent Lost: 8.7% Week 2: 120/220: Start: 885 End: 815 Amt Lost: 70 Percent Lost: 7.9% 60/90: Start: 885 End: 809 Amt Lost: 76 Percent Lost: 8.6% 35/70: Start: 887 End: 808 Amt Lost: 79 Percent Lost: 8.9% Week 3: 120/220: Start: 854 End: 802 Amt Lost: 52 Percent Lost: 6.1% 60/90: Start: 853 End: 791 Amt Lost: 62 Percent Lost: 7.3% 35/70: Start: 852 End: 791 Amt Lost: 61 Percent Lost: 7.2% Totals: 120/220: Start: 2535 End: 2344 Amt Lost: 191 Percent Lost: 7.5% 60/90: Start: 2536 End: 2318 Amt Lost: 218 Percent Lost: 8.6% 35/70: Start: 2536 End: 2327 Amt Lost: 209 Percent Lost: 8.2% – MERCH – Buy Michigan Rocks shirts and other merchandise here. https://michigan-rocks.myspreadshop.com – HIGHLAND PARK LAPIDARY – Highland Park makes some high quality tools at reasonable prices. They also have the best price on grit that I have found. I make a commission if you buy something through this link. It doesn't cost you extra. https://hplapidary.com/?ref=ROBERTABRAM Use promo code MICHIGANROCKS for 10% off rough rocks and accessories. – KINGSLEY NORTH – Kingsley North is a lapidary store in Michigan's U.P. They make a great cab machine and sell many other brands too. They have a huge selection of rough rock, tumblers, grit, jewelry supplies etc. at good prices. If you buy using the following link, I make a small commission. https://fas.st/t/u7uaxb5V This is the cabbing machine I use: https://fas.st/t/vCjRymKC – THE ROCK SHED – I buy a lot of lapidary supplies and rough rock from The Rock Shed. I don't make money from your purchases there, but they have good prices and good service. This is where I buy my finer grits and polish. http://rockshed.com – AMAZON STOREFRONT – I also have an Amazon storefront. This is where you can find other products you may have seen in my videos. As an Amazon Influencer, I earn from qualifying purchases. It doesn't cost you extra. http://www.amazon.com/shop/michiganrocks – SUBSCRIBE – On Michigan Rocks you can join me on relaxing rock hunts in picturesque Michigan. I'll also show you how to polish rocks and teach you other lapidary techniques. New videos are posted every Friday and some Tuesdays. Subscribe now so you don't miss any upcoming videos! http://www.youtube.com/c/MichiganRocks?sub_confirmation=1 – FACEBOOK – https://www.facebook.com/MichiganRocksRob