[niallc]

Hi Larry
Interestingly my copy of AP1564B (for the Hurricane IIA and IIB) has this to say:
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7. The maximum normal capacities of the magazines are as follows:-
No. 1 338 rounds
No. 2 324 rounds
No. 3 338 rounds
No. 4 338 rounds
No. 5 328 rounds
No. 6 328 rounds
Some aeroplanes have magazines of increased capacity for Nos 1-4 guns, as follows:-
No. 1 370 rounds
No. 2 490 rounds
No. 3 380 rounds
No. 4 395 rounds

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This gives a max capacity of 2676 rounds for an 8-gun aircraft with the standard magazines (3988 rounds for a 12 gun aircraft) or 3270 rounds for an 8-gun aircraft with the increased capacity magazines.
Note that this applies to Hurricane IIA which, as Andy has noted, had nominally the same wing as the Hurricane I, but I’ve no idea whether or not Mod 202, “Ammo. Boxes, capacity increased” was applicable to the Mark I or just the IIA.
HTH
Niall