When you load them and sthoot them again there will be more. Time to buy new brass.
why so much soot/carbon on the case and neck,,,,what kind and ammount of powder/bullet are you using,,,any crack in a case neck will affect the neck tension which affects accuracy,,,,roger
why so much soot/carbon on the case and neck,,,,what kind and ammount of powder/bullet are you using,,,any crack in a case neck will affect the neck tension which affects accuracy,,,,roger
You turned necks to 8.5thou thick for 5thou neck clearance.6 firings!!! It is a tight neck chamber .286 brass is turned down to give loaded round diameter of .281 which is 5 thou clearance or 2.5 thou each side
Trash it.
I'm going to take a wild ass guess that the neck life was effected by the neck trimming and chamber size. Maybe going .283 on the loaded neck next time, thicker neck, less expansion on firing. Also, how are you sizing? with a bushing just to get neck tension? Or an unhoned die that sizes down too far then expanding back up to the size you need? Too much work hardening.
You turned necks to 8.5thou thick for 5thou neck clearance.
So you sacrifice Lapua necks to make a tight neck chamber sloppy.
How much are you trimming from chamber end?
Here is another guess. If you have a .281 loaded round, and a .281 bushing, you essentially have Zero neck tension. If you are not jamming your bullets, the pressure isn't building quick enough to seal the neck to the chamber soon enough to prevent the carbon staining on the cases.
Keep your chamber clean of soot buildup, I don't know if the blowby of gases could speed up erosion, another question for those more experienced than me.is the soot likely doing any damage to the gun do you think? if its not I think I will just leave as is.
thanks guys will scrap it and keep a close eye on the rest cant say I have paid too much attention as they have only had 6 firings and everyone claims a lot more than that for the 6.5x47l but will certainly keep an eye out. And yes I have just annealed all the rest and did an inspection and cant find any more cracked so will be watching from now on.