I take it your going to scope the rifle? The Optima is sure able to make those kind of shots your talking about from all the posts I have read on them.

As for powder charge and projectile I would start at 75 grains of Triple Se7en FFg and then increase the powder charge until you get the tightest group with the projectile. This should come in around 90 grains. At least in my CVA Staghorn that is where it did. I now shoot Goex FFFg and I still have my best groups at 90 grains of powder.

The XTP's are good shooting bullets but they might not be the best choice for 200 yard shots. I think if your going to shoot out to 200 yards you would want to go with a 250 or 300 grain Hornady SST with the poly tip, or Thompson Center Shockwaves shoot fantastic out of my Staghorn. They are the same poly tip bullet as the Hornady SST but have a different sabot that my Staghorn seems to like.

Don't overlook the aero tip powerbelts for long range shooting. They can do it, and they still seem to have enough energy after reaching out that far to get the job done. Personally, and I mean no offence... I do not like the idea of shooting muzzleloaders out to 200 yards because most people will not practice those kind of shots. If your going to shoot that far, practice that far and learn your rifle. It sure saves a lot of work tracking wounded animals.....

Good luck with your rifle.