After seeing the two posts above I delved into this a little further by getting some measurements to see if it would in fact fit. I should have thought of that to begin with but thought it would be as simple as asking for loading data.

Anyway, thanks for everyone's input. SZA - I might take you up on your offer later if I have something like this come up again.
The OAL for the bullet itself is 1.037 inches. I measured other bullets intended for these two types of guns chambered in 44 Magnum and found that every other bullet, including a few 300 grainers, are much shorter, with the longest being the Sierra JSP. OAL was 0.891 inches for the Sierra.
If one were to utilize the middle of the main crimp while reloading the Hornady FTX the cartridge OAL would equal 1.820 inches. This means the entire polymer tip would extend past the end of my Smith & Wesson 629-3.
This could also mean it would not cycle through my Marlin 1894 Octagon. While I have some bullets loaded out to 1.615 inches, past the specified COAL of 1.610 inches found in the Hornady 7th edition reloading manual, they cycle fine in the Marlin as long as one does not “baby” the action.
There were other things that I took into consideration but the COAL in my novice reloading opinion makes everything a mute point. One could load these singly into the chamber of the rifle but I don’t see a big enough advantage over traditional type bullets to go to that trouble. I would think you could also use a 44 Special or Russian case to bring the COAL down, but again I don’t see the point. My interest in the 44 Magnum pistol and rifle combination is based on simplifying my life, not complicating it.
The bottom line is that I have to agree with Hornady in that the 265 grain FTX’s should be reserved for the 444 Marlin.
Thanks.