Thread: 6.5 Creedmoor load development

I found Lapua brass in 6.5x47 seemed to stretch more on first firing with a moderate load than expected, giving the impression of high pressure on extraction. This may have been behind your AR2209 experience? Perhaps your brass is similar in composition and manufacturing process (as the cases are in design) and prone to the the same behaviour? For a given load it affected some cases more than others in a way that could have been interpreted as "spiking". QuickLoad couldn't match the velocity and powder charge to the pressure signs by a large margin so I knew something odd was up. It settled down on a repeat firing, and then I lightly annealed and that fixed it completely.