For me, the Jewell
BR series trigger remains the standard by which other triggers are judged. Completely adjustable externally with no need to remove the trigger and deceptively simple in it's mechanism.
About the only way you can hurt one is if you hole a primer and the gas gets inside the bolt. That forces the firing pin assy backwards, the cocking piece jams back against the trigger sear connector, and everything inside the trigger stacks up in the reverse way of how the levers normally function. That can break the middle lever and sometimes the trigger sear connector piece.
The biggest issue by far with these triggers is poor maintenance and cleaning. I service and repair a fair number of these for shooters and with the exception of broken pieces related to holed primers, proper cleaning and readjustment is all that many need. Detailing the side plates and levers as needed also helps quite a bit.
Even when using a good bore guide, solvents have a way of wicking into the top of the trigger. Many people clean the barrel and then put a bit of oil, etc in the bore. Then the gun gets stood on the butt in the gun safe and the oil/solvent finds it's way back to the trigger. The fix for that is as simple as plugging the chamber with a couple patches or a piece of dental roll...like what many use for cleaning the lug abuttments.
Flushing the triggers with lighter fluid periodically is good for maintainence. Before each season, I dissassemble the triggers and give them a complete cleaning. It's simple to do and something everyone with a BR series Jewell should be capable of doing themselves.
The
HBR series triggers are different internally to allow the use of a safety. These have a small triangular lever that articulates on the middle lever. That small triangular lever is easily broken...especially if the over travel adjustment is wonked up and the trigger is dirty and gummy.
Good shootin'

-Al