Dents on shoulders of rifle brass

[50of4064]

I plan to be there at the next firing...let's see if we can duplicate this thing...I know we can't, but we will have fun trying...to many variables to replicate..
I am very glad nothing got damaged, no one was injured and we get to go at another day...
I PRAY THAT ALL IS WELL WITH YOU AND YOURS'

 

[conan32120]

Hey there , I'm back and I have some pictures...and some details to fix.
First. He shot two rifles that day a 300 WM and a 6.5 Creedmoor.
Second. He does not recall which ammo he shot first, the Horniday or the Aguila...both being factory.
Third. He did clean and oil the rifle before shooting that day.
Forth. The images you see are the 6.5 Creedmoor brass that has been reloaded in these imagesView attachment 1104908 ...but the dents are from the day that they were shot factory new.
Fifth. Only the Honiday brass showed any dents, the Aguila brass showed no denting. Not knowing the brass that was shot first does not help.
And yes, the denting looks to be hydrolic in nature to me, just as one might get if one were to apply to much case lube when reloading...but why on so many cases...we are talking about 10 cases shot in session, one could argue that by after a few rounds the oil should be dissipated and if not by then, when? That would be an afull lot of oil it would seem to me. They also look uniform, don't they? Or is it just me..so debris?

really looking hard at those dents they don't look hydraulic to me, seems to be a pretty well defined edge as if debris in die on these

 

[Mk-211]

It was factory ammo, more like debris in the chamber or unburnt powder.

 

[Bcwitt]

Hitting feed ramp, perhaps? Ive seen 556 do like that.

 

[David Hoback]

David, it had affected 10+ Horniday brass that day, he does not recall which brass he shot first, the Horniday or the Aquila..he did mention that all the dents were on the Horniday brass and not on the Aguila brass...I suppose he did not inspect his brass as he was shooting each round...I was not there...strange stuff...

Ahh, gotchya. I misunderstood. I’m confused though. You started, saying it was 300 WM, but then brought up 6.5cm. So which is it? And what rifle exactly?

 

[50of4064]

I have more questions than answers at this point, I was glad you all were able to shed some light on this mystery. I have limited data and do not wish to frustrate.
Thank you all for your input, and tolerance with me.
Sorry I did not have more details at my fingertips..