Muzzleloader systems include a pre-packaged propellant charge and primer for providing efficient loading and unloading of the muzzleloader. The muzzleloader accepts in the breech end the propellant containment vessel that abuts against a constriction portion with a reduced diameter portion. The propellant containment vessel having an end portion with a tapered surface that conforms to the constriction portion surface. A projectile is inserted in the muzzle end and seats against the constriction portion. The propellant containment vessel may be received in a removable breech plug. The constriction portion may be part of the breech plug or a separate component secured in the barrel by way of the breech plug. The containment vessel further comprises a primer mechanism that may be integrated into the proximal end of the containment vessel.

The disclosed ammunition is adapted for flowering into a plurality of sections upon impact with a body or object. The ammunition comprises a cylindrical casing, a charge disposed within the cylindrical casing and cylindrical projectile, defining a first portion within the casing and a second portion extending from the casing. The projectile comprises a projectile body and projectile jacket. The projectile jacket is disposed about at least a portion of the projectile body. The projectile body and/or the projectile jacket each define a leading end and a plurality of radially arrayed score lines formed therein, extending from the leading end. Upon impact, the projectile body and/or the projectile jacket flower into a plurality of radially arrayed sections, the sections being defined by the score lines formed in the projectile body and/or the projectile jacket.

The disclosed ammunition is adapted for flowering into a plurality of sections upon impact with a body or object. The ammunition comprises a cylindrical casing, a charge disposed within the cylindrical casing and cylindrical projectile, defining a first portion within the casing and a second portion extending from the casing. The projectile comprises a projectile body and projectile jacket. The projectile jacket is disposed about at least a portion of the projectile body. The projectile body and/or the projectile jacket each define a leading end and a plurality of radially arrayed score lines formed therein, extending from the leading end. Upon impact, the projectile body and/or the projectile jacket flower into a plurality of radially arrayed sections, the sections being defined by the score lines formed in the projectile body and/or the projectile jacket.

A bullet assembly comprising a bullet and a cup assembly, the cup assembly may have a ring portion for scraping the barrel of a muzzleloader. The cup assembly may be slidable on the bullet with an extended position and a contracted position, the contracted position having a greater diameter than the extended position. A contraction inhibiting member that requires shearing off of the member for contraction may be disposed on one of the components.