You have heard good advice. To understand why the difference in loading recommendations, you have to think in terms of loading a cartridge case. The barrel of your MLer is like a cartridge case. But, unlike loading Smokeless powder, which leaves almost no residue, Black Powder and the substitutes leaves a LOT OF RESIDUE. Every time you fire the gun, and reload, WITHOUT cleaning the barrel of the residue, Crud Builds up back at the Breechplug, and shortens or reduces the space at the back of the barrel for your powder charge.
Now, If you DON'T mark your ramrod, and load that PRB to the MARK every time, you probably are not going to see much of a change in impact of your ball on target, again, shooting off-hand. But, if you shoot from the bench, carefully, you will see that your POI changes as the barrel gets dirty. But its worse than that!
Sometimes, some of the crud gets burned up with the next charge of powder, or is blown out the barrel with the next charge of powder, so that a subsequent shot, instead of having to deal with an increasing smaller "powder chamber", may have a bit more room than you had for the last shot! So, the reduction of the " powder chamber" area in your gun does not change on a Linear scale, getting smaller and smaller with each consecutive shot fired.
The only way to insure that your barrel has the same amount of "space " where the powder is placed to burn that powder each time, is to clean the bore between shots. And that is the only way to insure best accuracy.
Its bad enough to spend lots of money and effort to get out for the short hunting seasons we now are allowed, and miss an opportunity to take game because of shooter mistakes, but when the miss is due to something in the gun, much less due to NOT cleaning the gun, its a real shame.
As you can tell from the responses, some shooters take great pride in being able to shoot all day without cleaning their barrels. I guess that makes their smoke-pole better than mine!
When I first got into BP shooting, I joined a club that was doing a lot of public shooting demonstrations, because I wanted to show the public how well these old style guns could shoot. I did lots of trick shots for those demonstrations, and we recruited a lot of new shooters to the club because of those demonstrations.
To do the most accurate shooting, I HAD to clean my gun between shots. It became a habit I employ to this day. But, I have never asked any other shooter to clean their gun as I do mine. I recommend it, but I don't tell them what to do. :shocked2: :blah: And if you don't clean your gun between shots, How about snuffing candles at night against me for a few bucks a candle? :thumbsup: