This is the definition of a "Muzzleloader" as posted on the ODFW website;
•Scopes (permanent and detachable), and sights that use batteries, artificial light or energy are not allowed during muzzleloader-only seasons and 600 series hunts where there is a weapon restriction of shotgun/muzzleloader only or archery/muzzleloader only, except for visually impaired hunters who have a visual acuity of ≤ 20/200 with lenses or visual field of ≤ 20 degrees (a permit is required; please see page 86). Open and peep sights made from alloys, plastic, or other materials that do not have the properties described above are legal sights. Fiber optics and fluorescent paint incorporated into or on open or iron sights are legal.
• It is illegal to hunt with on-lead bullets, jacketed bullets, sabots, and bullets with plastic or synthetic bases during muzzleloader-only seasons and 600 series hunts where there is a weapon restriction of shotgun/muzzleloader only or archery/muzzleloader only. Conical lead or lead alloy bullets with a length that does not exceed twice the diameter and lead or lead alloy round balls used with cloth, paper, or felt patches are allowed.
• It is illegal to hunt with centerfire primers as an ignition source during muzzleloader-only seasons and 600 series hunts where there is a weapon restriction of shotgun/muzzleloader only or archery/muzzleloader only.
• It is illegal to hunt with pelletized powders or propellants during muzzleloader-only seasons and 600 series hunts where there is a weapon restriction of shotgun/muzzleloader only or archery/muzzleloader only. Granular (loose) black powder and black powder substitutes are the only legal propellants during muzzleloader-only seasons and 600 series hunts where there is a weapon restriction of shotgun/muzzleloader only or archery/muzzleloader only.
• No other firearm may be used for hunting during a muzzleloader-only season (See definition page 10 or regulations book).
• Muzzleloading firearms with revolving actions are prohibited during muzzleloader-only seasons and 600 series hunts where there is a weapon restriction of shotgun/muzzleloader only or archery/muzzleloader only.
I do not see how they could possibly say the subbases are illegal as they are not part of the bullet. I do not see where the lead powerbelt could possibly be legal as I attempt to interpret these convoluted mish mash of words they call rules. I read somewhere they would accept a lead free bullet but it sure does not show up when defining a "muzzleloader" The "open ignition" rule is posted elsewhere in a chart that says what the minimum caliber for each species. These guys need to get a grip on the intentions of this restriction.