Canting your rifle (not having it straight up and down) can cause you to miss your target!
This is not to say that you can’t shoot with your rifle unless it’s straight up and down, however, you must be aware of the effect and be able to compensate for it.
In this NSSF video, I explain what will happen if your rifle is not level when shooting and I demonstrate the effects of the bullet impact on a canted (un-level) rifle.
If you’d like to learn more tips and tricks like this for precision rifle shooting, check out my Long Range Shooting Handbook.