i shoot 3 Knight Disc Extremes 50 cal, all with the Bare Primer Breech Plug and the new Mountaineer Bolt Housing. I use BH 209 exclusively. I've had great luck with Harvester's 300 Gr PT Gold, black crush Rib Sabot, 110 gr of BH 209 and Winchester's regular 209 Primer. It's a very accurate load and performs well on Game. You can buy in bulk from the factory. The staff is really helpful and great to deal with. Their 260 GR bullet is a good shooter as well, but where I hunt in West Texas we have Axis, Fallow and Aoudad and longer shots are not uncommon, so I opt for the heavier bullet with better down range ballistics.
I'm changing scopes right now and plan on trying some of the lighter Bloodlines etc. I'll let you know how they work out,