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Six rounds.
There were too many to easly list including rifles, pistols and automatic weapons. There are many books written about JM Browning which can do him better justice. He also invented the browning auto matic rifle which was used in world war2
20 rounds
Depends on gauge.
15
6 rounds
13 rounds of .44-40 ammunition.
No way to answer without knowing the caliber.
10
One
The new BPS High Capacity is probably the same as the defender which holds 7 rounds
The Barrett M82 anti-materiel rifle has a standard magazine capacity of 10-rounds.