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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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.

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

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

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


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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.

Can see machining rings on inside of die!


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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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Stop using Speights as the lube

take dies back....or get some others..... or polish the shite out of them.

Some die manufacturers coat the inside of the dies with a protective coating from the factory, needs to be removed with thinners or similar agent. Have struck this with a set of Hornady, once cleaned problem went.