Have a look at Spearman (1844) that give gun drill that is indistinguishable from the pre1800 gun drill of the RA being that it was abstracted from Adye (1801).
This gives reduced crew numbers of 8, 7, 6, 5, 4, and 3 that could operate a 24-pdr. [Adye (1806) 113-4] The more gunners and assistants (infantrymen) the better to pull the guns back into place.
8 men for a 24-pdr
3 & 4 run up and elevate
5 serves the vent, runs up, traverses and primes
6 run up, traverses and fires
7 brings cartidge
8 points and commands
4 men for a 24-pdr
1 sponges, runs up and points
2 brings cartridge, loads, runs up, and elevates
3 serves vent, runs up, traverses, elevates and primes
4 runs up traverses and fires
So you can see the 4 man crew are very busy.
Each of the pieces have instructions for the different parts of the drill.