I grease mine with just plain lithium grease, put it in & leave it in. Every now & then I will run a bead of patch lube grease down the barrel channel at the metal/wood fit to keep any water out should I get caught in the rain with it, but that is it. There is no reason to take the barrel out again. I know some say they take them out once a year & clean under them but I don't. After doing that for several years I found it to be a waste of time, as they were just as clean under there as when I put them in & all I was doing was taking a chance of messing upthe wood at the pins. I have rifles that are 150 years old that were not greased under the barrel & they had very little rust under them, so I feel with just a light coat of grease they will last fine. I have several that I took apart that were 30-50 years old & they had no rust problems under the barrels.
As far as the pin holes wearing, the holes will not wear as you are not supposed to remove the barel on a longrifle unless it is wedge pin retained. However, wear is not an issue on the holes, chipping out the wood or missing the pin is an issue that is a worry.. So grease the barrel, put it in & leave it. IMHO
:results: