Originally Posted by EddieHarren
On a properly made bore guide, the "nose" of the guide goes well into the chamber. The chances of having a broken rod hit the shoulder of the chamber are slim. I'll qulify that by saying on a short cartridge. If the cartridge is long, as in a 300 RUM or similar, it could easily happen. My advice, on cleaning procedure, varies greatly from another member's but I would suggest smaller jags or smaller patches.
Using a Lucas Bore Guide the chances are 0%, period, end of discussion... They will also prevent any of the cleaning materials from entering the chamber area, which means nothing flows back into the magazine area for example.
A good Bore Guide is the 1st step to cleaning a bolt action or any rifle that can be accessed with straight access into the chamber area. This is firearm maintenance 101 gentlemen.