LYMAN GPR Percussion breech Plugs

[Scota4570]

A friend has a GPR that does not fire reliably.  He is experienced.  It used to work fine.  I suspect the passage ways in the plug are caked up with fouling.  The obvious thing is to remove the plug and see.  

I have a real hydraulic barrel vice and proper wrenches.   Some modern rifles, TC, CVA and invest Arms are designed to make it near impossible to take the plug out and not wreck anything.

Are the Lyman GPR's a problem also?

[chubby]

I would use a smaller scraper than bore size if it is a 50cal i would try a 36 or 40 cal scraper, that chamber may be smaller than the bore. Or you could pull the nipple and clean out screw and soak in hot water to try & loosen the fowling.may save trouble??  Chubby

[Scota4570]

That is the most pragmatic approach.  

Being the type of guy who likes to improve things I thought I'd take a look.  If the flash channel is narrow I'd open it up.  I found a pic on line of one of these plugs.  IT is what I expected, seriously flawed.  

http://www.huntingpa.com/forums/ubbthreads.php?ubb=showflat&Number=3488081&page=

I'll see if the plug submits willingly or not.  If not then I'll clean it and move on.  A water pick and some hydrogen peroxide will do wonders.  If it comes out I'll do some re-engineering.  The practice of making such narrow flash channels amazes me.  If a gun is not reliable it is useless at best and dangerous at worst.