Have any of you seen this? These were reloads I shot last night and I haven't seen any of these markings prior to this, ~50 shots through the same gun.
P7
P7
- Thread starter P7id10t
- Start date
As long as it's confined to the neck it's pretty much OK. When you see that marking extend back to the shoulder you a stiffer load.
Just keep the chamber clean. I use a 50 cal bore brush in the chamber of my .308 to clean the walls/shoulder and a .35 cal brush to clean the neck area. If you get a carbon buildup in the neck area it can flake off in time and not allowing the neck metal to seal properly.
You can't eliminate it but you can minimize the long term effects by paying extra attention to the chamber area. On one rille I used a patch and GI patch loop to wet the chamber with some SLIP 2000. Kept it wet for about an hour then went at the carbon with a brush and larger bore mop. Next rounds were nice and clean.
Just keep the chamber clean. I use a 50 cal bore brush in the chamber of my .308 to clean the walls/shoulder and a .35 cal brush to clean the neck area. If you get a carbon buildup in the neck area it can flake off in time and not allowing the neck metal to seal properly.
You can't eliminate it but you can minimize the long term effects by paying extra attention to the chamber area. On one rille I used a patch and GI patch loop to wet the chamber with some SLIP 2000. Kept it wet for about an hour then went at the carbon with a brush and larger bore mop. Next rounds were nice and clean.
i get same marks from time to time, qurious what there from myself? i was thinking slight blow by around the case neck as i trim my .308 down to 2.000 below the published 2.005
Thanks- you might consider these light. iIRC 82gr RL22 on the lower cases, 89gr N570 on the upper.
I'll clean the chamber.
I'll clean the chamber.
Carbon on your necks? Normal. Even with some pretty stiff loads depending on the rifle, cartridge, number of loadings on the brass, etc. As the necks get harder from firing this becomes VERY common.
Because I have a 50 cal brush and not a chamber brush
I recently bought a chamber brush for my .308 and honestly think the 50 cal brush did a better job. One can take it and "profile it" using a cordless drill, a bench grinder, and a case for pattern. Then clean the whole chamber by just twisting it in the chamber like the M-1A chamber brushes or the AR-15 chamber brushes.
The necks aren't obturating to the chamber and that's allowing gas in. Time to anneal.
It may look "normal" to some, but it's not.
