Vertical shot string

[BrentD]

Question for all the reloading wizards. I've heard of vertical shot stringing but never paid much attention to the threads. I'd never seen it until now.
I broke in the barrel on my custom 6.5 bored #1. I figured I would start with a known load that produces excellent results with my Ruger Predator. I've been shooting the same load for years. So same load, completely different rifle and I got an S shaped vertical string about 6-8" with 5 rounds. What do I even start with looking for the WTF?

More data. A lot more data.

 

[ropeup79]

If you overlap most of those shots I bet you are within the rifles cone of fire. Pick one of those loads that you like the velocity of, load up 10-20, and see what it does. The stringing will probably look more like a circle.