Fast And Easy To Load, The Bore Driver delivers The Ultimate In Muzzleloader Performance. At The Heart Of The System Is a Polymer Base (Not a Sabot) That Seals The Bore To Deliver Maximum Energy Transfer And Accuracy. Atop The Base Is An ELD-X Or FTX Bullet, featuring a Rugged Gilding Metal Jacket Coupled With Polymer Tip Technology And An Interlock Ring That delivers Maximum Lethality.