On this new breech plug I put the drill bit in and marked it with duck tape. So from now on I know when to stop or if I need to go further. Thats what I did on my prohunter and I guess I was too excited when the bone collector showed up that I forgot to do it. And I did try using vise grips and the bit broke right off. It's pluged for good, but I was lucky enough to pick up the new breech plug and it was on sale. So it wasn't so bad.