Here is a "head scratcher"...

[ShootDots]

I have noticed with cases that have been fired many times over, YET are annealed, shoulders bumped back 2.5-3.0 thousandths in a FULL length die, That seating bullets in a Redding Competition Seater, that cases go UP into the sleeve like you have a very, very slightly too large of a diameter body on the cases! I have not experienced this before. I have scrubbed out the internals of the sleeve, to no avail. I even "buffed" a case to make it shiny, to no avail. QUESTION: "Do you think that it is the case body, work-hardened over many firings, that is simply "springing back", even though I allow the cases to sit in the sizeing die for about 4-5 seconds to have the brass "take a set"?

 

[Rdlningcltchdmpr]

Can you take careful measurements of the old brass vs new brass after sizing ??? That might help.

 

[BoydAllen]

I think that you may be correct.

 

[ShootDots]

Can you take careful measurements of the old brass vs new brass after sizing ??? That might help.

I don't have calipers that go down to the 10 thousandths or maybe even less than that.. Sorry..

 

[DngBat7]

In say this not knowing if this is possible, but is it possible the seater die is faulty and maybe Redding used old or worn tooling to ream it out? Maybe a couple thousandths shy? Is this a new die? If not, I guess this is not possible.

 

[M14AMU]

Try bumping shoulder back just .001" and see the result thereof!

 

[coldboreshot]

I have noticed with cases that have been fired many times over, YET are annealed, shoulders bumped back 2.5-3.0 thousandths in a FULL length die, That seating bullets in a Redding Competition Seater, that cases go UP into the sleeve like you have a very, very slightly too large of a diameter body on the cases! I have not experienced this before. I have scrubbed out the internals of the sleeve, to no avail. I even "buffed" a case to make it shiny, to no avail. QUESTION: "Do you think that it is the case body, work-hardened over many firings, that is simply "springing back", even though I allow the cases to sit in the sizeing die for about 4-5 seconds to have the brass "take a set"?

Are these the same F/L and seater dies you have used throughout the course of this brass or has there been a new introduction of one or the other along the way?

 

[kolar55]

Maybe it's time for some new brass!

 

[ShootDots]

This "phenomenon" only happens with 30+ loaded brass. I have come to the conclusion it is the "body" of the case that has "sprung back" and unless I use a small base die, it will continue. I will just have to toss the "old / old" stuff as recommended above.. Thanks for everyone's reply>>>it is much appreciated..

 

[jelenko]

About how many times have the 30+ cases been reloaded?

 

[AllenOne1]

Switch to a Forster sizing die they seem to be tighter than the Reddings.

 

[watercam]

About how many times have the 30+ cases been reloaded?

Loaded 30+ times

 

[Metal God]

Are these the same F/L and seater dies you have used throughout the course of this brass or has there been a new introduction of one or the other along the way?

Or rifle , I think coldbore is on to something . What has changed ? I new rifle , a new hotter load .

Loaded 30 times , assuming they are still good . Maybe on the next sizing run you use a small base die . That should work , again assuming you can keep loading them safely .

 

[chkunz]

Try a small base sizing die.

 

[ShootDots]

I am quite sure a small base die would "solve" the problem. However, the problem exists on really old brass. It is probably a wise thing to do to simply start with new brass.

 

[Webster]

I have noticed with cases that have been fired many times over, YET are annealed, shoulders bumped back 2.5-3.0 thousandths in a FULL length die, That seating bullets in a Redding Competition Seater, that cases go UP into the sleeve like you have a very, very slightly too large of a diameter body on the cases! I have not experienced this before. I have scrubbed out the internals of the sleeve, to no avail. I even "buffed" a case to make it shiny, to no avail. QUESTION: "Do you think that it is the case body, work-hardened over many firings, that is simply "springing back", even though I allow the cases to sit in the sizeing die for about 4-5 seconds to have the brass "take a set"?

If you can chamber a fired case you don’t have to set the shoulder back.

 

[jelenko]

Loaded 30+ times

Wow! At least for me, I'm lucky to get through 7 reload cycles [with an AR, though].

 

[Texas10]

Are you also experiencing "bolt clicks" with those well worn brass? That is my indication of time to put them in the recycle bin a get new brass. At that point, the case walls have become so work hardened that they basically refuse to take a sizing, are hard to eject and hard to process though the dies.

At 30+ reloadings I'd say you got your money's worth.

 

[DOGCAPPER]

Check the neck thickness. With 30+ reloads the brass may have migrated up into the neck..
If you can't measure, just turn one case neck and load for a test. No primer , no powder.

 

[jim_k]

I have reloaded LC brass enough that it did this, but was fine after using a small base die. All firing was in bolt rifles.