^^Thanks, but that's not the regulations, that's what's in the hunting guide. In any event, my initial reply was wrong as it is was the old definition. In 2021, the Iowa Administrative Code was changed. The crossed out sentences below were removed. Not that it matters much, but while google searches claim electronic ignition is illegal, I can't find any law or regulation in Iowa that makes it so.:
Item 2. Amend subrule 106.7(3) as follows:
106.7(3) Muzzleloader seasons. Only muzzleloading rifles and, muzzleloading muskets, muzzleloading pistols , and muzzleloading revolvers will be permitted for taking deer during the early muzzleloader season. During the late muzzleloader season, deer may be taken with a muzzleloading rifle, muzzleloading musket, muzzleloading pistol, centerfire muzzleloading revolver, any handgun as defined in 106.7(2), crossbow as described in 106.7(1) "b," or bow as described in 106.7(1). All muzzleloaders as described in this subrule shall only shoot a single projectile between .44 and .775 of an inch.
a. Muzzleloading rifles are defined as flintlock or percussion cap lock muzzleloaded rifles and muskets of not less than .44 caliber and not larger than .775 caliber, shooting single projectiles only.
b. Muzzleloading pistols must be .44 caliber or larger, shoot single projectiles only, and have a 4-inch minimum barrel length.