I'm back and want to ask one more dumb question because I think I understand my problem now. I was shooting some 9 shot bursts RAW format. I did 4 rounds of 9 shots remote trigger. I brought my camera back in the house and pulled the card and loaded to my computer and the camera had only written 18 of the shots. Is that the gap between the buffer speed and the card write speed? I'm guessing I left it out there a minute after the last shot was fired. If so would the 260-300 write speed card make that big of difference?
In diving into this a little deeper it turns out your D7200 does
NOT support UHS-II as I stated it did previously. My apologies for the error; I would have bet money on that but I was clearly incorrect. That being the case, take UHS-II rated cards off your list of options. Looking at this site:
Memory Card Speed Tests should answer most of your questions. In short, it appears the D7200 buffer maxes out at a write speed of roughly 75MB/s so you're going to want cards that support, or exceed, that write speed.
More specifically, and in regards to your last shooting session with the lost photos, are you sure you allowed the buffer to clear the first nine shots you took before shooting the next nine? If the green light on the back of the camera is illuminated, that means the buffer is still transferring data/writing to the SD card. If you took additional shots
while the buffer was still clearing it might explain why you didn't come home with all the shots you were expecting.