Nuguy,
You get some blowback primarily in the primer extractor area. I have found the blowback is less with BH-209 powder than with 777 powder.
I wrap the breech plug with plumbers tape from the front to the back of the plug and coat with "Slick 50 grease" ( no longer made) which results in a pretty clean breech plug after shooting. Doing this makes for a tight breech plug fit so I have to use the slotted breech plug tool to un-lock the breech plug and then just pull it out of the breech.
Doc
