sabotloader i use a t/c 50 cal., traditions 50 cal. and i am working with a new frontier mag. i have had the first two for years. all i have every used was the bore butter. but i don't shoot them today and wait days to clean them. i clean them the same day i use them. if i had one that leaked presser threw the breech plug threads i would be shipping it back the factory. sounds like the plugs are made at one location and the barrels are coming from another. anyway you look at it it is a poor design that should be corrected. you should not need anything on the threads to seal.