trimming cases

[Harpoon1]

I know the book states a trim length. I understand you can get away with longer, and I have. How do I know when longer is too long?

Sorry if I broke a rule asking this here instead of the ammo section. These cases are in bolt gun only, specifically H mini.

Buy a borescope! Seriously, they’re less than $50, the video is incredibly clear and you’ll be able to see exactly how much room you have left with over sized brass. On top of being able to inspect and see exactly what condition the inside of your barrel is. Some of the best money I ever spent!