To some degree. From a text book point of view the total work done on the bullet is computed by multiplying the force on the bullet by the distance travelled down the bore. This work increases the energy of the bullet by giving it linear velocity and angular velocity. The more twist, the higher angular velocity it gets, and thus the lower the linear velocity, all things being equal.Originally Posted byNashvilleMike

Now the real world tends to be a bit more complicated than that, with friction, non-constant forces, etc.

I'd say you'd have to measure it to be sure of what really happens .

Chris.