Using this model, the paper studies the affection of the change of the bore diameter in each feature section to the initial velocity of projectile, and the relationship between the initial velocity of projectile and the total change of the bore diameter.

• 并用该模型研究了各特征截面内径改变量对弹丸初速改变量的影响,以及弹丸初速改变量与总内径改变量间的关系。