Six rounds.
The number of .22 long rifle shells a Browning takedown rifle can hold depends on the specific model and magazine capacity. Browning takedown rifles typically have magazine capacities ranging from 10 to 25 rounds. To determine the exact number of .22 long rifle shells a specific Browning takedown rifle can hold, you would need to refer to the manufacturer's specifications for that particular model.
20 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
6 rounds
15
Depends on gauge.
13 rounds of .44-40 ammunition.
No way to answer without knowing the caliber.
One
The Barrett M82 anti-materiel rifle has a standard magazine capacity of 10-rounds.
The new BPS High Capacity is probably the same as the defender which holds 7 rounds