Scratches on brass neck

[josebd]

I have cleaned,polished the die twice, I can see some vertical scratches on the neck of the brass but real faint, can' t feel with finger

 

[josebd]

I have cleaned,polished the die twice, I can see some vertical scratches on the brass but real faint, can' t feel with finger

 

[josebd]

 

[jepp2]

No disrespect intended, but stop looking so closely at your brass. With the magnification of the picture, you are going to see things to worry about, that are nothing to worry about. I personally don't see anything of concern. The case mouth looks a little sharp I think, but the angle can't tell for sure. You don't want a sharp edge left from inside and outside chamfer/deburring. I will include a couple of pictures that show what you want, and don't want (not sure who to give credit for the pictures, I didn't create them I'm just sharing them).

If your die picks up some brass in the neck due to no lube being applied to the outside of the case neck, the marks will be much more pronounced.

 

[josebd]

No disrespect intended, but stop looking so closely at your brass. With the magnification of the picture, you are going to see things to worry about, that are nothing to worry about. I personally don't see anything of concern. The case mouth looks a little sharp I think, but the angle can't tell for sure. You don't want a sharp edge left from inside and outside chamfer/deburring. I will include a couple of pictures that show what you want, and don't want (not sure who to give credit for the pictures, I didn't create them I'm just sharing them).

If your die picks up some brass in the neck due to no lube being applied to the outside of the case neck, the marks will be much more pronounced.

View attachment 1047486 View attachment 1047487

Ok,I understand

 

[yukonal]

Nothing wrong with your necks.

 

[BenPerfected]

Try using a small piece of 600 grit emery paper and twist the neck between your thumb and forefinger. Not likely to not do much at the target, but it is a nice finishing touch on your brass/necks just prior to lube and seating.
Ben

 

[michaeljp65]

Nothing wrong there mate, try some 0000 steel wool.

 

[mongo chicago]

I don't see anything either. So why bother with the steel wool etc.

 

[Webster]

No disrespect intended, but stop looking so closely at your brass. With the magnification of the picture, you are going to see things to worry about, that are nothing to worry about. I personally don't see anything of concern. The case mouth looks a little sharp I think, but the angle can't tell for sure. You don't want a sharp edge left from inside and outside chamfer/deburring. I will include a couple of pictures that show what you want, and don't want (not sure who to give credit for the pictures, I didn't create them I'm just sharing them).

If your die picks up some brass in the neck due to no lube being applied to the outside of the case neck, the marks will be much more pronounced.

View attachment 1047486 View attachment 1047487

Had a similar much more severe problem from not chamfering the neck o.d. enough. Don't worry about it. Your pic looks like the neck has a little metal rolled over the edge. Not chamfered enough. In any case it's not a sharp clean cut edge with a slight obvious bevel. These edges or small particles of brass can break free when neck sizing and get dragged down the neck causing scratches. I give a light chamfer at every reload. I use very little pressure and turn until the rough feeling goes away. Practically zero metal removed. More chamfering needed after trimming to length. I did metallurgical failure analysis for 45 years. Always looked for small details.

 

[Shynloco]

Nothing wrong there mate, try some 0000 steel wool.

+1. Seems inevitable with some dies no matter how much you've polished it. I found those scratches have NO effect on accuracy or case runout.

Alex

 

[K22]

Have the same condition. Has no affect on accuracy or performance. If the dies are RCBS they will polish them for free but I wouldn't bother; it's a cosmetic thing and won't affect case life or performance.

I'm pretty sure mine was caused by sizing new cases that weren't chamfered which embedded minute piece of brass into the neck area of the die. Just a theory. Seems to bare out since newer dies I've purchased don't exhibit this condition since I now always chamfer new case necks before sizing. In the past I would size new cases first, trim, then chamfer; now I trim (if necessary), chamfer, then size.