TNHagies

I use both depending on how tight the breech plug fits...

The key to using tape is to snug the face of the BP up to the face of the flange in the barrel. If you have applied the tape correctly (what I call correctly) when you snug the plug up it will compress the tape between the two flanges and stop blow back at that point so it does not even enter the threads...

Here is a pic of what I am talking about thanks to UC and his graphic abilities...





Like I said works for me on each of my inlines but know guarantees on yours...