Sighting-in doesn't come any easier than that!
The 200 yard range may not come so easy. If good shot groups allude you at 200, try a couple of things. You may need to tweak your powder charge by including a 30 gr pellet. Lots of success stories using three pellets (150) with Pyrodex/Shockwave, but not as many using 777 @ 200. You may also think about bringing a pack of those bridge bases sold at Precision Bullet or Cabelas. If you can't find those, buy a pack of 54 caliber lubed wonderwads. I find the bigger diameter wad seals better in 50 caliber bores.