Quoted:
Quoted:
2 3/4" rounds have 9 or 12 00 Buck, your choice....
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do the shells with 12 pellets have less powder?
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Don't worry about the powder, just look at the weight/size of the pellets and the muzzle velocity.
Shotgun shells are loaded according to two things. (1) total weight of the pellets/ slug and (2) muzzle velocity.
The heavier the load(pellets) the slower powder must be used to propel it out the muzzle at a safe pressure.
Shotgun loads started out as black powder loads. Black powder uses up alot more volume than smokless. Therefore the length of shotgun hulls corresponds to a length suitable for black powder loads.
With the transition to smokeless there is a lot of 'empty' space in modern shotgun loads. This space is taken up by the wad, which has a shot cup to hold the shot, a 'seal' at the bottom next to the powder, and collapsible 'legs' to take up the rest of the space.
There are many different wads available, depending on the load you are making.
Finally, some loads have no wad, instead they use a piece of cardboard that separates the powder from the load. The rest of the hull is then filled with a mixture of pellets and a filler, called a buffer. The purpose of the buffer is to try to reduce the deforming of the pellets, which are subjected to extreme forces during firing and get flat spots on them. Out of round pellets will not fly straight, leading to holes in your pattern.
Of course all this stuff means nothing at close range, like inside you house.