Hi everyone!!!,,,I have been testing this too,,I use 16oz. Wide mouth Kerr jars with a 51z and I like it,,it has an awesome hot/cold throw,,,It is consuming off the sides very well,,,melt pool is about 1/2 inch,,,burned for 3 hours,,,so far so good,,,,poured @ 165 in heated jars,,,,Have had to do re-pours (only one),,,,it sunk right down the center weird but it seems to be okay so far,,,getting ready for the second burn,,,,,I think I had bad shrinkage due to a cold kitchen:rolleyes2 ,,so my DH is helping me set up in another room of the house,,,,,so I will make another tester in warmer room,,, I hope everyone is doing well during the holidays,,,, MERRY CHRISTMAS EVERYONE,,,,HO! HO! HO! My DH says " Bah Humbug" LOLOL hes is really a sweetheart,,,,