Yes, add water keeping a little back then small amount of ballast which scours the drum then cement and when well mixed to slurry add rest of ballast and rest of water as required.
I have mixed hundreds of tons of compo,concrete,etc and this is by far and away the best way for a consistant mix in the shortest times that I have found over 60 odd years of mixing..never too old to learn though if anyone comes up with anything better
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