Please clarify your question! "Acceleration of compare with rifle" is not a complete sentence and doesn't make sense.

To help me understand what you're asking, please provide more context. For example:

* What are you comparing the acceleration of? Is it a bullet, a person firing a rifle, the recoil of the rifle?

* What is the purpose of the comparison? Are you looking to understand which has greater acceleration, or something else?

Once you provide more information, I can give you a more helpful answer.