Chopper,
I've too have been using 139 Hornadys. I use the SST variety. Hornady told me that they start to expand at 1500 fps and have a BC of .486. I use a max load of W748 and CCI primers with great success (IMR 3031 and 4064 have done well too but not as well). The velocity is around 2150 fps across a Pro Chrony and accuracy has been outstanding with 3/8 inch groups being the best. I've taken numerous deer with this load and penetration has been outstanding. I've not taken a hog with it but I would have no reservations trying. BTs are great but I can't see paying for them when 139 SSTs do so well.
Merry Christmas!
Shootnstr8