I don't know who makes RCBS furnaces but mine:
1) Do NOT suffer spout freeze up like the two Lymans did (even after factory service/adjustment), and
2) Do NOT have to be run wide open. My thermostat dials are set between 700-750 and work fine for me.
My first preference would be a pair of original SAECO furnaces as made when Bob Modisett owned the company. Unfortunately that is not possible and Bob is no longer with us.
Good shooting and be safe.
LB
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