Every one of my MLs get the same treatment. Hot soap & water scrubbing, followed by a hot clear water rinse.
Dried, swabbed with alcohol patch and dried again.
A patch or two of T-17, dried.
Then treated with bore butter.
The only difference is my Genesis gets treated with a quality gun oil instead of BB.
Some of the guys don't like BB - but I've never had any issues with rusting using it. The trick is to be sure you get the barrel good and hot and dry before applying it.