2nd scratch build - Precipice

[Rabbit]

Personally I'd fit 500k pots. Various forums talk about the Ric 330k pot having a measured value that's normally just below 500k, so maybe their agreement with CTS was to badge up 500k pots that measured slightly below 500k with their '330k' part number (also to put people off mimicking their circuit, so copies using real 330k pots have a lower value than Ric use)?

yes, but, according to sources:

I've just read that the volume pots in Cliff's bass are 330k ones not 250k, which seems reasonable as they have used those value pots.