Fast and easy to load, the Bore Driver® FTX® 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.
www.hornady.com
There are worse choices but they’re pretty soft in the tests I’ve seen. There are better options as far as I’m concerned - like 300 gr Thors and big heavy (420-600 gr) No Excuse conicals.