Rick,
If in India they received the first matchlocks when meal type powder was in use, then a stop of some kind between powder and projectile was important, as mealed powder won't ignite if compressed. (Meal powder was finely ground sulphur charcoal and saltpetre and would settle out in transport so had to be re-mixed.)
It would appear that in India, this powder chamber in one form or another became standard, even when it wasn't required anymore when corned powder came into use.
There shouldn't be a gap really between powder and ball, so they likely had it measured pretty close so as to not create problems. (For instance, just enough powder to fill the chamber, and a tad more, so the ball sat on it, (or the wad) without unduly compressing it.
Richard.
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