Thin ring of wax on case mouth after shooting?

[osteodoc08]

I was out shooting my M57 with a new load. It was a starter load of AA#9 behind Blammers 230gr LFN boolit. Sized to .411 and lubed with LBT Blue. About 15-20% of them had a very thin halo of wax approx. 0.10" in height at the case mouth when I extracted the casing. Accuracy was surprisingly good at 15 yds and there was no issues with functionality. I loaded these last week. Using a starting load of Longshot using the same boolit, primer, seating depth, etc did not cause this. It occurred in my M57 and Ruger BH that I typically bring along with me. Both acted similarly, so I don't think its the gun. I've never seen it before and was just curious.

[stephenj]

Nothing to worry about .
It is just the bullet lube filling the space between the case and the end of the chamber .
I get it all the time with slightly short cases

[osteodoc08]

100338

[osteodoc08]

Yeah, but I'm not using short cases. I'm sure its benign, I just wanted to find out why

[JonB_in_Glencoe]

I assume the lube is just filling the space from the end of the case to the begining of the cylinder throat.
I've seen similar when I use Carnuba Red Lube.

[osteodoc08]

OK. So what causes it to do this? I've never had this before and now, I have to figure out how to get all this lube off the cases before they gunk everything up.

[JonB_in_Glencoe]

easiest solution is to use a softer lube, so it blows out. or a harder lube so it doesn't leave the boolit.

[stephenj]

Getting the "gunk" off is easy enough.
A tumbler works just fine .. it is just lube and powder fouling after all .
Or if you lack a tumbler .. stop at tje grocery store and buy some lemi shine
You will have sparkly clean brass in the matter of minutes .

Theres a sticky somewhere on lemi shine ( citric acid )

[osteodoc08]

It's all in the tumbler now. I've just never seen anything do this before so it was new to me.

[robroy]

To Keep it from happening you could use a bit stiffer load to better seal your cases against the chamber walls. If the accuracy is what you want it to be and you don't care about cleaning the cases up leave it alone.

[osteodoc08]

To Keep it from happening you could use a bit stiffer load to better seal your cases against the chamber walls. If the accuracy is what you want it to be and you don't care about cleaning the cases up leave it alone.

This was my first go at it using AA#9. Im gonna keep increasing until I get leading, worsening accuracy, or pressure signs. It seems to be a very promising combination so far.