Just been out for some load testing with the 6.5x47, have had no problems up to today, I was trying a couple of loads and noticed there was quite a bit of sooting in the extractor groove on a couple of the cartridges, there was also a lot on the bolt face. There are no pressure signs on any of the cartridges otherwise and out of 15 fired it was just three, one with light sooting and the two (on right of piccy) with a lot of sooting. the rest were perfectly ok (two on left of piccy) I am using brand new, Full length resized Lapua brass. I had to junk 8 cartridges to start with as necks were badly damaged, sent details to Lapua who said they would look into it but have never got back to me.
Could it be a faulty batch of cases or am I doing something wrong.
Loads tested were
Federal Primers - 100gr Nosler Bt's
Would be grateful for your views on this please.