Yes 200yds is a long range for most rifle shooters as well I will add. I would worry a bit about down range energy with the 200g bullets unless I have them smoking out of the muzzle.

There are some good ballistic charts out there that can give you real good info on retained energy at long distance. In my Encore manual for example it shows that a 240gXTP fired with 3 50g pellets will have 1210f/p of energy at 200yds compared to a 300g XTP that will have 1420f/p of energy at the same range.

But as they say ballistics are always grey for some reason the 275g XTP has less retained energy at 200yds than the bullet lighter or heavier than it. It come in at 1185f/p?

So the 200g bullet you are testing will probabally shoot flat enough, find out if it retains the killing power you demand out of expensive bullets.