I am not going to say more accurate, but, but much easier for me to work up a load. I beleive its the powder ignition mostly. I am sure other factors go into play. I can almost watch a chrony and know which load is the best iwith a 308 or 7mm-08. Std dev go down down, then up, up as the load goes up. With my 300RUM or others like that, its hard telling.