Advice needed with marks on neck

[Mc Fraser]

Hello,
What could cause the marks on the neck? I can see them in almost every round, I have 8 of them loaded.

300WM 200 gr ELDX the pictures are from the same bullet.
Norma brass 1F, annealed and run though Forester seating and bushing bump neck sizing die. RCBS RC IV press, measured 2 thou runout, round never chambered.

TIA

 

[WeiserBucks]

F-ed up bushing perhaps? Pull it out and check it.

 

[elf]

I get those too. The bushings are causing it. I ignore them because they cause no harm and don't seem to affect accuracy. You can lube each neck before sizing, then wipe them off after seating

 

[CatShooter]

I have had those at times - came from little tiny bits of brass building up and sticking to edge of the mouth of the bushing.

When looked at with a magnifying glass, it looked like the bushing was defective.

Soaking overnight in bore solvent removed it. A bit of lube on the case necks from time to time prevented it from coming back.

 

[26Reload]

If you have a bore scope..run it into the die and check for the suggested problem....
Looks superficial...doesnt look like heavy scoring....

 

[bigedp51]

Below is a bushing that had embedded grit inside the bushing and then started picking up brass. If nothing is done more and more brass builds up and it can cause more and deeper scratches. The bushing below had been polished with 0000 steel wool and what you see is what was not removed. Meaning the embedded grit is still there and will just start picking up more brass.

Any copper bore cleaner will remove the brass and its strength will determine how long it takes. So use a bore cleaner that curls your nose hairs and makes your eyes water when you sniff it to remove the brass. Next take a snug-fitting bore mop and apply some J&B bore paste, automotive rubbing compound, Mothers Mag and Wheel polish, etc and polish the bushing or die. This will remove the embedded grit and polish the bushing or die.

This is a common problem on full length dies if the neck shoulder junction is not polished correctly at the factory. Then this rough area starts picking up brass and starts scratching the case neck.

Below a factory polished Forster full length die as a comparison.

P.S. CatShooter old buddy, if you didn't buy cheap bore cleaners you wouldn't need to soak the bushing all night............................Bazinga!

 

[CatShooter]

P.S. CatShooter old buddy, if you didn't buy cheap bore cleaners you wouldn't need to soak the bushing all night............................Bazinga!

I use Captain Morgan's Spiced Dark Rum... clean the bushings over night, and drink what is left in the morning. )))))))

 

[Mc Fraser]

Thank you all.

 

[338 dude]

Below is a bushing that had embedded grit inside the bushing and then started picking up brass. If nothing is done more and more brass builds up and it can cause more and deeper scratches. The bushing below had been polished with 0000 steel wool and what you see is what was not removed. Meaning the embedded grit is still there and will just start picking up more brass.

Any copper bore cleaner will remove the brass and its strength will determine how long it takes. So use a bore cleaner that curls your nose hairs and makes your eyes water when you sniff it to remove the brass. Next take a snug-fitting bore mop and apply some J&B bore paste, automotive rubbing compound, Mothers Mag and Wheel polish, etc and polish the bushing or die. This will remove the embedded grit and polish the bushing or die.

This is a common problem on full length dies if the neck shoulder junction is not polished correctly at the factory. Then this rough area starts picking up brass and starts scratching the case neck.

Below a factory polished Forster full length die as a comparison.

P.S. CatShooter old buddy, if you didn't buy cheap bore cleaners you wouldn't need to soak the bushing all night............................Bazinga!

BAZINGA I love that show big bang theory sad it's done

 

[AK49Norseman]

Following along...

so on these dies with superficial scratches; is it feasible to polish with lapping compound to smooth it out? I've experienced these as well, but have yet to clean/replace the bushing. There's a reason I lurk here- to get answers & you guys always surprise me with things I don't know- THANK YOU!

 

[AK49Norseman]

I also found this article which may be of use:
https://redding-reloading.com/tech-line-a-tips-faqs/149-scratched-cases-causes-and-cures

Thanks guys...

 

[okie man]

Good read!

 

[tnek13]

Good advise, I have used Fitz polish on an appropriate mop chucked into a drill.

 

[J E Custom]

Replace the bushing and move on, they are cheep.

J E CUSTOM