I went out to ladder test today. I was using some RP brass, which I bought as .280 rem, and fired in the rifle to change them to .280AI. They didn't shoot very well. Anyway, I used a neck sizer die only on them, and then reloaded a ladder that was going to go all the way up to 61.5 grains. I started getting case separation signs at about 57.5, and this happened at 58 grains.
Could someone give me the quickload data for this load?
4000 Feet elevation, 70 degrees
.280 Ackley Improved
160 Grain Nosler Accubond
58 Grains Reloader 22
26" Bbl, 1:10 Twist
The only thing that I can think of is that when I fired the Remington factory stuff, nearly all of the primers were lifted out of the primer pockets. I took this as a sign of low pressure, was I wrong? I do not know what to make of this, probably because I am inexperienced. I am a good ways back from the lands. From everything I've read, I should not be getting this much pressure with this load, so I either have a crappy batch of brass or a hot jar of powder- or I have other problems. Any advice?
Ladder test was an epic failure, but the dispersion on the lower end of things was very good and I hope that I am getting enough velocity at around 56.5 grains. I need a chronograph bad.