Forster FLS die leaving shiny ring around bottom of case?

[kmw1954]

Stick that brass into the shell holder and see if it aligns with the top or just above before it makes contact with the die. My guess, that's as far down as the die will contact. I have new brass that looks the same way.

 

[p5200]

I see what you're saying. the die may be coming to a stop. I'm using a Forster coax and pulling the handle back up may be causing shell plates to leave the ring where they close around the case. My eye sight is not very good but I will investigate the best I can.

 

[AJC1]

Measure your new unfired case at the height of the ring, Measure the same place after firing, and again after sizing. That will tell the story. The base to .400 datum would also be a good set of numbers to have, telling how much growth on inital firing. This number will tell you how reasonable case head seperation worries are. If inital growth is +.010 then you know the chance is good.

 

[emb]

The photos don't really do justice to what I was seeing. Out of 103 pieces of brass, 25 of them had distinct rings or were developing rings above the webbing. The remaining 78 pieces did not and looked shiny new all the way to the base. Brass is cheap compared to the alternatives. As I mentioned I have plenty of brass such that I don't need to use a case to obvious failure. Could I have used them a couple more times? Probably without incident. But, as the saying goes, I'd rather be safe than sorry.

 

[CoalCrackerAl]

I wear reading glasses while loading. It helps me a lot with my sight. The sizing die should tough the shell holder. Then turning it in a 1/8th to 1/4 turn more.

 

[p5200]

This case shows at least 3 rings and some more spiraling around the case when magnified? Also it's a Winchester case.

 

[p5200]

I wear reading glasses while loading. It helps me a lot with my sight. The sizing die should tough the shell holder. Then turning it in a 1/8th to 1/4 turn more.

I adjusted the die to measure the same as the new unfired rounds for starters using Hornady comparator set.

 

[p5200]

May have found problem? This is a view into bottom of die. Seems to show rings inside of there. Surely it should be smoother than that? If that's the problem I will order a new die can't be good on the brass.

 

[kmw1954]

So did you stick a piece of brass back into the shell holder? Curious.

 

[p5200]

Yes the ring appears to be higher up. But maybe that is as far down as the die will go and causing the ring?

 

[CoalCrackerAl]

My Lee rifle dies were like that. I switched them out for RCBS dies. Nice finish with the RCBS.

 

[kmw1954]

So if you look into the die you will see a chamfer, is it higher than that?

 

[p5200]

It's kind of hard for me to tell I'll check some more.

 

[kmw1954]

Don't have any pictures but I see that same mark after resizing even new brass for the first time with both 223 and 6mmARC.

 

[jmorris]

I can't always tell by looking at them.

Some stuff looks suspicious and others might not. How about a "guess what case is thinning out" test?



If you answered both, you have a good eye for it.



FWIW I caught the case on the right by how much it needed to be trimmed. Something to take note of.

 

[AJC1]

May have found problem? This is a view into bottom of die. Seems to show rings inside of there. Surely it should be smoother than that? If that's the problem I will order a new die can't be good on the brass.View attachment 1201660

You said that was a forester 308 die which happens to be what I use. They have a die service department that does honning, more geared toward the neck area, but I'd be on the horn with them seeing if they will polish/hone it. It could be the die, but then it would do it to all brass not be brand specific.

 

[Walkalong]

.35 Remington case that has no thinning, just expansion from a fat chamber.