Another update...
Well, the world is now out of 200 grain Hornady flat points. I've squirreled away a few boxes, but they are now "out of stock" at all of the reloading component suppliers. So, just to cover my bases, I ordered those "LeveRevolution" 200 grain flex tips.
The loading data appears the same as for any other 200 grain bullet. I'm a bit suspicious - the shank is longer and the nose is shorter, putting more bullet in the neck of the case. This is normally a pretty sure way to raise pressures. It looks, however, like there is going to necessarily be a pretty long jump before they engage the rifling, so maybe that serves to offset how much bullet is in the case and thereby lowers pressures. We'll see. I'm starting with a pretty moderate load of IMR 4350. These sure look weird, for a round that is supposed to be safe in tubular magazines. Goes against everything I've learned about this.