Re: 280 Rem Loads
I haven't loaded 160 on my 280 yet but I do have a good load for 150 grain Ballisic Tip. My powder of choice is IMR 4831 and I use 55.5 grain for 150 and 56 for 140. Both load shoot tight on my Douglas barreled Argentine Mauser Model 1909. My velocity on 24" Douglas were around 2900 on the 150 and 2987 on the 140. I used Federal 210 match primer and Federal brass.
H4831 is ideal for the 280. H1000 will be on the slow side. If I were you, I'll try H4831 first. Good luck
To achieve the maximum possible accuracy, all variables must be remove or at least minimize.