Ballistics don't match, and his gun was never fired.

弹道学不匹配，而且他的枪根本没有发射过。

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It may be used to determine the effects of bore curvature thermal deflection of the tube eccentricity of the projectile interior ballistics data and construction of gun tube on dispersion error.

可用于确定内膛弯曲度、身管热变形、弹丸偏心率、内弹道诸元和身管结构等对射弹散布的影响。

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Based on the mechanism of gun erosion of interior ballistics, the method and process of predicting the gun tube life are presented.

该文根据火炮膛内烧蚀机理，提出了预测身管寿命的过程和方法。

youdao

Another Clinton proposal calls for tougher enforcement of firearms laws by proposing funding for more federal agents and prosecutors and to create a program to track gun use through ballistics testing.

CNN: No lame duck State of the Union address for Clinton

Authorities said they were running ballistics tests to see if they could conclusively link the gun Ebel used in Texas with the one that killed Clements.

NPR: Shell Casings May Tie Texas Shootout To Colo Death

Surprisingly, such doubts also extend to ballistics a technique that claims to be able to identify a gun from marks left on bullets fired from it.

ECONOMIST: Whose body of evidence?