Not Sponsored] Holly 'o hell, I have just found an awesome reload calculator. Gordon's Reloading Tool is slick as hell. : r/reloading
I downloaded Gordon's reloading tools to check out some of my loads. It simulates over pressure on my 9mm 147gr 3.5grn320 load. My velocities in real life are around 920 vs the 970 GRT shows : r/reloading