- Jan 13, 2019
I picked up a kimber hunter 84l in 280 ackley this summer and am finally getting around to load development. I decided to start with the Berger classic 168 and 4831. Saami spec on the 280ai is 3.330 coal. This rifle jams a bullet into the lands at a coal of3.250 tight enough that it will pull bullets every time. So I'm looking at loading to 3.240 to start for a 10 thou jump. This throws published load data and pressures out the window. Anybody have a formula to estimate pressure increase vs diminished case capacity?