I just picked up a 700 Mountain Rifle in .280. I am only interested in shooting two bullets out of this rifle, the 120 ballistic tip and the 140 accubond. If it won't shoot those it is going down the road. I have never played with .280s before and looking for some "tried and true" loads for a place to start, hopefully with what I have on hand.

I have on hand the following powders:

Alliant- RL 15, 17, 22, 23, 26
Hodgdon- 380, 414, 4895, 4831sc, Superformance, Hybrid 100V
IMR- 4350

Thanks in advance.