Every barrel made is different. Some tighter tolerance than others, different internal finish, due to the manufacturing process. A 'tight', or slow barrel will grip the projectile more and therefore give lower velocities for the same pressures.
Every barrel made is different. Some tighter tolerance than others, different internal finish, due to the manufacturing process. A 'tight', or slow barrel will grip the projectile more and therefore give lower velocities for the same pressures.
Experience. What you get just after you needed it.
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