Turkeyhunter,
I have had good luck with Remington and Federal factory, non-premium loads in the 150 grain class. I know they are not loaded with fancy bullets, but they really seem to work. Complete penetration and a nice wound channel. My understanding of the Winchester Ballistic Tip is that they expand and hold together fine under a certain impact velocity, which I would guess the .280 would be under at 150> yards. That's my experience, good luck. I also see a post regarding ballistic tip bullets about ten below your post. I read some of that and maybe you could too. It's insightful.