"Tweaking" a load

[chaneylake]

Sorry, but I keep thinking of more stuff.
You might also give patching between shots a try.
I have always patched this rifle with just one wet patch between shots so if you are blow tubing and the group is going to hell you are fouling out.
Nothing will shoot through a fouled out barrel.
Your basic load is sound as I set some national records with that load and the P/Jones bullet before switching to the Saeco.
I think the Saeco's bc is better than the P/Jones because it requires less elevation all the way to 600 yards over the P/J Creedmoor.
Steve R.
AZ.

I will give the patching at try Steve, I just fired the same load again except I used a 0.06 poly wad, first 4 shots measured 0.90 inches at 200 yards then the final 6 opened to just under 5 inches, my first thought was fouling out,

thanks for the info

Cheers