Not to try and persuade you otherwise, but with that 300gr CP bullet, if your hitting between 1350fps thru 1550fps with it you going to knock what ever you send it after on it's rear. You will be amazed at how well they work and penetrate.
There is at least a couple of discussions on the velocity and meplat of the WFN type bullets over on the Castboolit site. If you do a search on a member there named 44man, you will find plenty of info on loads for the 44mag as well as first hand experience on what the bullets discussed will do and at what velocities.
From first hand experience using the CP 260gr WFNGC in .452 through my Raging Bull pushed to just over 1500fps I can tell you that they will indeed shoot from rears to ears or visa versa on 250'ish pound hogs. Bumping up in weight to the Lee C452 300RF that I cast myself and push to just over 1500fps from the same revolver, I had no issues what so ever dumping a 100'ish pound sow on her nose at 87 yards. The thing with the WNF type bullets is that if you run them too fast you will simply get a cookie cutter type result where the bullet simply cuts a diameter hole straight through. Running them in the range stated above you will get more actual energy transfer so to speak where the meplat will develop a pressure wave in front and actually disrupt more tissue than if it were moving faster. Sounds a bit bass ackwards but I have found it to be true in shooting a bunch of stuff but for the most part hogs in general.
As for thepowders you mentioned, either will suffice, but 2400 will be more user friendly when working towards a specific velocity rane. The 296/H110 works excellent when looking for the top end of the velocity range, but isn't nearly as versatile. One other powder you might also look at is Accurate #9. I have used it right in along with the others and find it will nearly equal the velocities of 296/H110, but can be loaded over a bit wider velocity range.
Anyway hope this helps.