Yup. Our law specifically prohibits ones cobbled together with a "plug".
In Oregon, that a non issue.
As such, the shotgun would then be legal under the definition of "smooth bore muzzle loading shotgun"
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There are no set seasons for different harvest methods - a muzzle loading shotgun fits the same regulations as any modern shotgun - only restrictions there pertain to max bore size and max shot size.
Rifles, handguns and crossbows, nor muzzle loading rifle or handgun are not allowed for turkey.
BT53