Derringeer
New member
How much pressure will escape from a vent-hole based on the size of the vent-hole? How much velocity will be lost based on caliber and barrel length regarding the size of the vent-hole?
For example, when the caliber and the gunpowder load is small it makes sense that the vent-hole also has to be small, and the opposite is true with a big caliber and big load like in a cannon. But how do you know when big is too big for a vent-hole? Could a gun with a short barrel, like a philadelphia derringer, use a bigger vent hole than a gun with a long barrel without any loss in velocity since the bullet will exit the muzzle before all powder has been combusted inside the barrel anyway?
For example, when the caliber and the gunpowder load is small it makes sense that the vent-hole also has to be small, and the opposite is true with a big caliber and big load like in a cannon. But how do you know when big is too big for a vent-hole? Could a gun with a short barrel, like a philadelphia derringer, use a bigger vent hole than a gun with a long barrel without any loss in velocity since the bullet will exit the muzzle before all powder has been combusted inside the barrel anyway?