Flat spot on case neck .204

[Grtwhthntr]

I finally cleaned out my reloading room and was going to start reloading again and was inspecting the 3 boxes of once fired brass I have ran through my new .204 and noticed one spot on the neck of each case is slightly flattened out of round. Not a huge amount but enough to be seen with a visual inspection. All 60 rounds were manually fed one at a time at the range, and with the exception of a case or two that got away on me, all of them were picked out of the receiver as the bolt was opened. Everyone had the identical slight flat spot. Anything to be concerned about? I realize the dies will take this out but am wondering about the cause or if this is frequently seen? Never seen this on any of my 25.06 or 30.06 cases I have reloaded before. Could it be a flaw in the chamber? Gun shoots under 1" groups at 100 yds with factory ammo and frozen fingers. Any input is appreciated.

 

[Bobby Ironsights]

Yes, do a cerrosafe chamber cast.

 

[Grtwhthntr]

Can you give me a little info on what that is and how I go about doing so?

 

[Grtwhthntr]

OK, did a search and found that cerrosafe or legend safe as available from a Canadian distributor is a metal for making casts that melts at low temps and expands 3.3% rather than contracting when it cools. I presume making a cast of the chamber for inspection is what needs to be done here, any leads to where I might find some info on the step by step process? Also, would taking it to a gunsmith with a .204 reamer possibly clean this up?

 

[Lefty Dick]

Post a few pictures.

Could be as simple as on extraction the case nicks the ejection port.

 

[Glock4ever]

Sounds like you have a strong ejector - could be that after you are firing the bolt is pulling the round out of the chamber and banging it against the inside of the receiver. If your rifle shoots well, this isn't an issue.

 

[Grtwhthntr]

Picture

I think you may be right LD, upon further inspection there is a very slight "brass" spot on the lip at the center of the slight indent on each cartridge, presumably from rubbing. I also noted how they come out of the action and the casings are pushed to the right and dragged by the bolt once they leave the chamber, likely causing the deformation. I have added a pic, the "dents" on the two cartridges are facing each other.

 

[Grtwhthntr]

Thanks Glock4ever, I think that is infact what is happening, time to start reloading.

 

[roccoskeet]

I'm with Glock4ever I had a 35 Whelan that did the same thing on ejecting the case. It puzzled me also.

 

[Mount Sweetness]

Glock4ever is right, I see this on one of my rifles as well

 

[shootist22-250]

My T-3 in 223 does exactly that. The case catches on the inside of the receiver as the case is extracted. No biggie, the die looks after it quite nicely.

 

[44Bore]

Common occurance with spring-loaded ejectors--yours looks quite mild--I have a couple of rifles that really mash them--have not got around to clipping a coil or two off the spring.

44Bore

 

[shootist22-250]

Common occurance with spring-loaded ejectors--yours looks quite mild--I have a couple of rifles that really mash them--have not got around to clipping a coil or two off the spring.

44Bore

Cases which have been dented are more accurate.