Ok… so here is my take… I have had several muzzleloaders and am currently shooting the Lyman Great Plains (Hunter Barrel) in the .50 cal, using the Hornady 385 gr. Great Plain Bullet backed by 100 gr. of Pyrodex, I also use the Remington #11 cap.
I have not had any misfires… the rifle is very accurate out to 100yards.
Now…. As far as the regulations and why in Washington… the issue really comes down to the “type of weapon and history”. The current “Muzzleloader” season is pretty much mostly the traditional type of weapon, there are some rifles that are “inline” and don’t use the #209 primer… but it is open or traditional sites, no scopes (why would you need them for 100 yards)… but it is to try and keep it more traditional…
I know that there has been talk in the game department to break seasons into more categories, i.e. archery/bow into traditional/compound, muzzleloader traditional/inline. The BIG drawback to me and I have stated, is then we ALL will get less time for our seasons.
I believe that maybe the seasons should be based upon range of shot… Modern Firearm (100 yards PLUS), Muzzleloader (100 yards or less traditional style) and Archery (60 yards and less). If you want to use a Modern Muzzleloader (Pyrodex Pellets, #209 primer, Sealed “Flash Pan”, Jacketed Bullet) and shoot out past 100yards then just go ahead and put that type of weapon into the Modern Firearm Season…

Just my $0.02 worth … no offense to anyone.
Shoot Straight