Data for 155 Lapua Scenar, Lapua Brass, Vhit N540, .308 AI AXMC with 24 inch 12 twist barrel - Help needed and this might help someone

[jim996]

Hi everyone. I'm very new to reloading and I shot these loads today over a magneto speed 3. I'm still analysing the data and trying to make some sense of it. I've plotted the speeds of the rounds as it might help other people working up this load. I'm trying to decide on a powder load to settle on for further development. I'm shooting the round out to 1000 yards so they need to be launched quite fast. I measured the chamber at 72.25-40mm (difficult to be really precise) my thinking is the 72.0 COAL will jump slightly to the lands while the 72.25 should be almost touching.

I'm leaning towards 45.3 gr in the 72.25mm COAL cartridge as this seems to be in a flat spot on the graphs and gave quite a low SD. I'm very open to suggestions from the more experienced guys out there. Open to ideas.