Big gun exercise?

[Hammers]

IAbout a year ago I purchased the British HLBSC 8" Howitzer with crew. The miniatures are rather odd, looking like they've been sculpted by two entirely different sculptors: the heads are almost too realistic while there is something rather wonky about arms, legs, shoulders e.t.c. Anyway and to my point: since a I know very little about gun exercise after 1830 above 20mm I wonder what each of the 6 man crew is supposed to be doing. The officer is eazy enough to guess, but the others? Anyone know?