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Old October 4, 2021, 07:32 AM   #14
HiBC
Senior Member
 
Join Date: November 13, 2006
Posts: 7,639
I recently watched a you tube video on the firing of naval guns. The turrets and magazines and elevators,etc.

Its not brass cased fixed ammo. The projectile is loaded, then "bags" (for lack of a better term) of propellant are loaded behind the projectile. The last thing loaded into the chamber is where the black powder comes in. Its a smaller bag of Black Powder used as an ignition charge to get everything else lit up.

FWIW, BP often gives remarkably uniform velocities through a chronograph.
A uniform ignition might be a good thing when you are shooting 20 miles.
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