I have used the 225 ftx bullet thru the Taurus Gaucho pictured in my siggy link... and it works great,... i use a load of 8.0gr of W-231. and i seat the bullet at the crimp grove. I took a dremmel and ground down the polymer tip to ensure clearance thru the rotating cylinder... made me a poor man's critical defense load.....
i can tell you this.... when i loaded those for the first time, i looked at the pistol face on and it was a scarry site seeing all those red tipped HP's starring at you...
Your 200 gr ftx... i've not seen yet,,,, but my load above will lay you on the mild side for a 200gr since i was at 225gr bullet.
You have unique.... try it with a fuzz more.... maybe 8.5 to start... go to 9.5gr trying 6 shots at a time...9-9.5 should get you at a 900-1000 fps range.