The simple answer, No. Center fire is associated with cartridge guns and refers to the location that the firing pin strikes the cartridge or more precisely the primer. If you look at a .308 shell for instance you will see a round button at thebottom of the shell, that is the primer and the "center" of the shell. Thus a center fire. The newer in line rifles that use 209 shotgun primers could be very loosely categorized as center fire rifles, but in common terms are known as in line ignition.
You will have to tell us if you are talking about black powder or center fire.
YOu need to see a gunsmith immediately
NO.
You will have to specify if you are referring to black powder, rim fire or center fire and the weight of the projectile
.45 calliber
Depends on if you are talking black powder, rim fire or center fire. 300-25000 ft is ballpark .
no it does not
22 hornet is a 22 calibre rifle. Most think of a 22 rifle as a rim fire rifle. But it shoots a 22 calibre bullet but the cartridge case that fires the bullet is no where near the same. The Hornet holds much more powder and is center fire.
The grains of a bullet, be it black powder or not , is the weight of the bullet. Lets say you have a .50 caliber rifle, and fire a 250 grain bullet at a target and hit dead center. Then fire a 300 grain bullet, that bullet will hit slightly lower on the target , but will have more force or stopping power" due to the weight. So the higher the grain the heaver the bullet.
Yes
CF
Read the roll mark on the rifle.