Separate Keyframe Ranges?

Hey guys, I’ve been working on modelling, rigging and animating a weapon. For the animation part, I want some of the actions to have a different frame range than the others. For example, one action has a range of 40 frames, and another has a range of 8 frames. I’ve been looking for a way to do this, but when I change the range size, it affects all the actions including ones from a separate armature. Is there any way to do this?