AC if you load one (1)of these cases a dozen times with the same load what do you get as a velocity spread? I`d hazard the ES of the load pretty much covers the vel deviation you`ve found. I don`t remember where I read it but I recall some writer stating someting on the order of a 10% increase in case volume leading to a 2.5% vel increase with equal pressures.

Clown

"Interesting" doesn't begin to describe it!

Now, I'll have to try some experiments of my own just as soon as winter is over.

What would be really interesting is the pressures. In the 06 the pressure would have to be 4 or 5% higher to get that extra 50 fps. But in a larger case?? Something else at work here. I'm gonna guess aliens. You can't fool Mother Nature but it sure looks like she's fooling us.

I know I can't explain it. After seeing the results and having a chance to think about it what do you say?