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Try googling "used lab equipment" and look for a Decon FS100B. It won't be as cheap as an Aldi, but it was made for a hard life in industrial laboratories,
and has a stainless 2-3 litre tank, plus heat and timer controls up to one hour.
One tablespoon of citric acid plus one splurge of non-bio washing liquid per litre, set to 60C, timer to 30mins, and away you go.........
I've never filled mine to the brim, but I reckon it'll hold 2-300 308 cases.

Here's one: http://akribis.co.uk/decon-fs100b-heate ... -bath.html

Pete

I also just use an Aldi one, although for cleaning awkwardly shaped gun parts rather than cases. It certainly works well, as my stripped to the metal Benelli M2 bolt will testify to

Yea....any ultrasonic cleaner that uses stainless media

Used several ultrasonics and now only keep my old Lyman one for cleaning parts. The STM does a much better job and is pretty much fire and forget....and you still have to dry the cases