Re: Factory Ammo for new .280 Remington
I have two older Remingtons in .280, one aobut 50+ yrs. old Mod. 721, and other about 25 yrs in Mod. 700 Mountain Rifle. The older guns shoots 100 yd. 1" groups with any factory, but really likes (1/2") the heavier 160 gr. Remington PSP's for some reason. The Mod. 700 prefers lighter factory ammo in the 130-150 gr. range, but is not particular to brand. Any of the loadings you mentioned will get the job done, it will just depend on how it processes each one.
I reload, and have a few boxes of factory, and if you're in the Houston area, would be willing to help. If you don't have a use for the spent brass, I'll take it off your hands, and would suggest the following test:
Shoot one round from each factory load at the same target/distance. Chose load closest to zero point and go with that.