Another Bess user...
I have one, had it for over 10 years and I love it...
Check the ram rod itself, is it gummy?
Maybe there is a build-up of machine oil on the end of the rod...
I suspect that there may be a few wood shavings in the ramrod channel, from where they drilled it...
I know that on the .69 caliber and the .58 caliber muskets I have, there is a ramrod retaining spring that looks like a bent spoon, in fact, it's called a
ramrod spoon...
I gave my bess the once over and it is still a little tight, this is to keep the ramrod in place under recoil, I see no sign of a ramrod spoon being used, so I suspect it's a tappered hole...
You could try a little wax on the sticky section of the rod, this may help...
If you must remove the barrel, you will need to drift out the barrel retaining pins (tap them out towards the right side of the stock) as well as removing the bolt at the breech end of the barrel...
Keep the pins in order, so you can reinstall them correctly...
Take a section of fine emmery paper or steel wool and polish the ramrod down by the section that sticks, over time, the rod will loosen up...
What loads are you planning to use?
Lyman's Black Powder Handbook list the following loads for our besses...
.715 round ball (545 grains)...
.020 pillow ticking patch lubed with Crisco...
20 thru 150 grains of G-O FFg black powder...
G-O FFFFg priming powder
I use 90 grains of FFg GOEX powder, a .735 round ball with a .015 pillow tick patch coated in Wonderlube myself...