Buck
I do not have a TC Pro-hunter but I assume the barrel bore is one of the tight as with most new TC products. It can possibly range from .499 to .501, with that in mind I can tell you.
1. Both of my Omega's which are older Omega's I shoot HPH-24's or regular Harvester sabots and if I am shooting regular Harvester's I do prefer the shorter sabot for the 250.
2. If that is to tight to get down the bore in a managable way way then try some MMP HPH-3p-EZ sabots. They are thinner than the HPH-24 and from my Omega's they shoot very very well - but I do prefer the sabot to be just a bit tighter
3. And if you have one of those .499 bores the Harvester 'crush rib' is the way to go
Just to tell you or suggest to you the Speer Gold Dot 300 grain is a really good bullet with a BC of .232, but it will add bearing surface to your bore so if you have one of those tight bores the 259 with less bearing surface might load up easier. I actually prefer the 250 for whitetail, the BC is not the greatest but that bullet will shoot to 175/80 yards with not thoughts at all. It has a very deep HP, something akin to a Barnes, and expands in hurry even on a thin skinned whitetail - It will pass through on most occasions and it will cause massive internal damage.
Another Speer you might be interested in if you like shooting 44 cal bullets is the .430/270 grain Speer Gold Dot. This is a soft point and looks much more like a conventinal hunting bullet. It is also bonded and you would probably need the Harvester green 'crush rib' for that bullet. I bought a couple of boxes the last time in was in Sportsman Whse. and plan on testing them this spring and summer. Might be a better all-around bullet.
Might look at this explanation
http://www.speer-bullets.com/html/produ ... nd_GoldDot