And, as it sounds like you are doing, you can always arrange your variance so it's all *above* the minimum... i.e. 1.125 to 1.135, rather than 1.120 to 1.130.

Good call on the flat-nose plug, gonna get one of those.

Homemade inertia tool... I'm picturing a 12 ga shell firing a chamber gauge holding the bullet into a block wall... bullet out!