Thread: Why…? Rings marks/scoring brass after FL resizing?

Always clean die and brass before hand. Doesn’t seam to matter how much or little lube I use Im always using a fair bit of pressure on press to re size. (Redding dies, 300norma mag) bumping shoulder 2thou.



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grit somewhere.......

are you lubing neck??? makes job easier by a heck of a lot...powdered graphite is awesome for this.

Originally Posted by Micky Duck

are you lubing neck??? makes job easier by a heck of a lot...powdered graphite is awesome for this.

Yeah mate sure am! Definitely makes it easier but still getting there marks!


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your not using the plurry toothpaste stuff are you???/

Is it only after sizeing? Looks to me like its the finish in your chamber and thats marking the case when fired

whats weird is the bottom photo...shows a line across rim...now thats not from die..die doesnt touch it,only the base. you are missing something simple.

A die will only give you longitudinal scoring, not circumferential. DEF suspect it's chamber machining marks.

Originally Posted by 6x47

A die will only give you longitudinal scoring, not circumferential. DEF suspect it's chamber machining marks.

Can see machining rings on inside of die!


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Originally Posted by 6x47

A die will only give you longitudinal scoring, not circumferential. DEF suspect it's chamber machining marks.

Greetings,
Another vote for a rough chamber. The case springs back a little after firing so you don't see marks on the case until you re size the case. The marks on the rom and in the rim recess are from the extractor. Some details and history of the rifle would help. Get a gunsmith to check and polish the chamber.
Regards Grandpamac.

Originally Posted by 6x47

A die will only give you longitudinal scoring, not circumferential. DEF suspect it's chamber machining marks.

Originally Posted by grandpamac

Greetings,
Another vote for a rough chamber. The case springs back a little after firing so you don't see marks on the case until you re size the case. The marks on the rom and in the rim recess are from the extractor. Some details and history of the rifle would help. Get a gunsmith to check and polish the chamber.
Regards Grandpamac.

This and this above^^^^

Even if your die does have machining marks in it if it was causing the marks on the brass they would be lenghtwise on the case.
Got a photo of a new unfired case that has been sized?
Photo inside die?
Photo inside chamber?

Really looks to me like you have a rough chamber and sizing your brass is highlighting all the highpoints in the brass once it is formed in the chamber.

Just put once fired brass through die and got the same rings/scoring. Brass had no marks at all beforehand??


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Might be copper from the bullet that gets peeled as you seat the bullet then sits lose in the chamber and as you chamber the next round this is where you get that scoring.
But that is usually not straight, because as you left the bolt to extract or chamber this is when it scores the brass.
Q: Are you sure it was on there after reloading and not before, ie as a new case?
That nick on the rim sort of leads me to think that.
The worst I have seen is from redding dry neck lube, a ceramic ball getting in the die when neck sizing. God knows how it got there but made a right mess of the brass.

Originally Posted by Sideshow

Might be copper from the bullet that gets peeled as you seat the bullet then sits lose in the chamber and as you chamber the next round this is where you get that scoring.
But that is usually not straight, because as you left the bolt to extract or chamber this is when it scores the brass.
Q: Are you sure it was on there after reloading and not before, ie as a new case?
That nick on the rim sort of leads me to think that.
The worst I have seen is from redding dry neck lube, a ceramic ball getting in the die when neck sizing. God knows how it got there but made a right mess of the brass.

Hey, just put some new and once fired brass through die which had no blemishes or ring in it ect before hand but once re sized can see them straight away.. i can see machining rings on inside of die and for whatever reason i seam to need to use a fair bit if pressure with my press..can be easy to jam cases in it!


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Right not what I thought then good! Next Will be interested in what the issue iswhen you get to the bottom of it

Originally Posted by GuyDowding

Hey, just put some new and once fired brass through die which had no blemishes or ring in it ect before hand but once re sized can see them straight away.. i can see machining rings on inside of die and for whatever reason i seam to need to use a fair bit if pressure with my press..can be easy to jam cases in it!


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