Sabotloader,

Is that your Remington"s Breech plug in the last photos?

Breechplug,

Because the threads on the breechplugs are relatively course threads, Just being a little loose is several thousands of an inch. The o-rings used in the above mentioned posts are available at Lowes in packs of 100 IIRC. they will be found as faucet repair parts I believe. Your rifle, if it has looseness to the primer pocket, the o-ring would make a good seal. from what I have read on GB outdoors they last a long time also.

Donot run with a loose bP, this will allow gas cutting of the threads to get started, Once this starts the BP will be ruined fast and there is a good chance that the thread internaly in the barrel will suffer also. Grease-oil-tape, in/on the threads of the BP act as a sealant, yes even a film of oil.

Notice on Sabot loaders shown BP above the threads do not go all the way to the face. This is important and has a purpose, if there is gas leakage at the sealing surface( and I asure you there is on a naked BP, SLs tape helps stop it) This gas leaked will be Hot and very High Pressure, The small area of no threads is an expansion chamber (for a lack of better terms), this small area will allow the temp of the leaked gas to cool some and bleed off pressure slowing them down minimizing the gas cutting and erosion to the very important THREADS.

Ken