I have a Gap-10 in .260. I use Nosler brass, 140 amax, CCI 200 and h4350.
I had load data from the previous owner of 42 grains h4350 and a 140 smk bullet. I got ejector swipes at 42 gr, so I backed down to 41 grains and the 140 amax. That load works really well in my rifle with muzzle velocity...