FWIW, I load 130 ABs with the same powder, charge weight, primer and cases as I use with 130 Partitions and 130 BTs. The only adjustment I made was to seat the ABs as long as they would feed reliably through the magazines, resulting in a bit longer COAL. In my two pre-64 Model 70s and my Mauser custom, they shoot five shot groups about the same as the BTs and a little better than the Partitions. All run in the .75-.85 inch range at 100 yards.
