How many liters of material is ideal for a 5L BF?

I don’t want to do small runs below 1L in my 5L BF. How much is typical to load a 5L BF for optimal results? I have a 5L mantle, would I be able to use a 2L BF if I use sand or rocks to fill in the Empty space in the mantle?

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Use aluminum foil, put the rbf all the way into the mantle and cover with wadded foil. Keep in mind it’s gonna run a little differently.

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