Dimple in resized case

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Dimple in resized case

Post by GPostal » 08 Feb 2015, 4:50 pm

I started resizing some .303 Remington brass - fired twice - when I noticed these dimples in the case side.
What causes this ?
Ive checked settings on the press and still does it.

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Re: Dimple in resized case

Post by Baldrick314 » 08 Feb 2015, 5:06 pm

Could be too much lube but it looks pretty severe for that.

Were you full length sizing?
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Re: Dimple in resized case

Post by tom604 » 08 Feb 2015, 5:43 pm

lube, too much. should be more on the shoulder though???
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Re: Dimple in resized case

Post by Jack V » 08 Feb 2015, 6:05 pm

It could also be unsuitable lube and it's detonated ( rapid oxidisation under pressure) Try another type of lube like RCBS liquid sparingly .
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Re: Dimple in resized case

Post by Warrigul » 08 Feb 2015, 6:18 pm

GPostal wrote:I started resizing some .303 Remington brass - fired twice - when I noticed these dimples in the case side.
What causes this ?
Ive checked settings on the press and still does it.


You weren't firing light loads by any chance?

Other than that s h ite in the die or too much lube.
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Re: Dimple in resized case

Post by GPostal » 08 Feb 2015, 8:03 pm

Baldrick314 wrote:Could be too much lube but it looks pretty severe for that.

Were you full length sizing?


yes

Warrigul wrote:
GPostal wrote:I started resizing some .303 Remington brass - fired twice - when I noticed these dimples in the case side.
What causes this ?
Ive checked settings on the press and still does it.


You weren't firing light loads by any chance?

Other than that s h ite in the die or too much lube.


No to light loads

Maybe too much spray - ill try something else next time
Thanks

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Re: Dimple in resized case

Post by Josh Smith » 09 Feb 2015, 3:40 am

I use a very light coat of lanolin. Not much at all is required, and mine is applied with plenty of alcohol.

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Re: Dimple in resized case

Post by Bills Shed » 09 Feb 2015, 4:51 am

I agree it is too much lube. On that note, with a spray it is usually pretty hard to over it as it puts on a very thin coat. I would clean the inside of the dies just in case you have a build up of crud.

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Re: Dimple in resized case

Post by Jack V » 10 Feb 2015, 9:42 am

Buy a better lube and use less of it .
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Re: Dimple in resized case

Post by Lorgar » 10 Feb 2015, 9:44 am

I got the same while necking down all my .308 brass to 7mm.

Forcing the .308 neck through the .284 die for the first time is obviously more difficult and excess pressure is applied to the body of the case crumpling part of the case. I found it more on the bottom of the shoulder sometimes continuing into the wall.

I don't neck turn my cases so there was the additional thickness after necking down. I had a significant number of cases do it on the initial FL resize, after firing the dimple popped out and cases were good as new. After they'd been fired and the necks had stretched a little I necked sized them (and trimmed them) for reloading again and only a handful crumpled the second time around. After 2-3 firings/resizes the problem resolved itself.

How difficult are you finding it to press the die through the necks?
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Re: Dimple in resized case

Post by Warrigul » 10 Feb 2015, 10:39 am

Lorgar wrote:I got the same while necking down all my .308 brass to 7mm.

Forcing the .308 neck through the .284 die for the first time is obviously more difficult and excess pressure is applied to the body of the case crumpling part of the case. I found it more on the bottom of the shoulder sometimes continuing into the wall.

I don't neck turn my cases so there was the additional thickness after necking down. I had a significant number of cases do it on the initial FL resize, after firing the dimple popped out and cases were good as new. After they'd been fired and the necks had stretched a little I necked sized them (and trimmed them) for reloading again and only a handful crumpled the second time around. After 2-3 firings/resizes the problem resolved itself.

How difficult are you finding it to press the die through the necks?


Yep, could be a sloppy old .303 chamber as well causing an excess flow of brass, I have seen that before but usually it is indicated by the need to trim excessively remington .303 is pretty thin and usually isn't an issue with .303.
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Re: Dimple in resized case

Post by bunnybuster » 10 Feb 2015, 4:13 pm

Simple,too much lube,buildup in the die or pressure dent caused by air lock in die,overlength case will not cause this,[nor a sloppy chamber] just load 'em and shoot 'em.

WTF is this lube detonation ? what does it sound like ? what MV does it generate ?

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Re: Dimple in resized case

Post by Oldbloke » 10 Feb 2015, 7:57 pm

" lube detonation " Got serious doubts about that. It isnt a diesel engine.
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Re: Dimple in resized case

Post by GPostal » 10 Feb 2015, 8:12 pm

Lorgar wrote:I got the same while necking down all my .308 brass to 7mm.

How difficult are you finding it to press the die through the necks?


Seems fine, nothing unusual.
All good thanks - used less spray and gave them a good shake in the box afterwards and nomoredimples,
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Re: Dimple in resized case

Post by Warrigul » 10 Feb 2015, 8:17 pm

bunnybuster wrote:Simple,too much lube,buildup in the die or pressure dent caused by air lock in die,overlength case will not cause this,[nor a sloppy chamber] just load 'em and shoot 'em.

WTF is this lube detonation ? what does it sound like ? what MV does it generate ?

Be Safe BB.


Honestly I would put my money on too much lube or sh i t in the die too but I have seen similar before when there as been excess brass to resize, especially making .303/22 or .303/25 cases.

Never heard of lube detonation before.
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Re: Dimple in resized case

Post by Kater » 10 Feb 2015, 8:46 pm

LOOK OUT! HE'S GOT SOME LUBE!

:lol:

Just kidding :D
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Re: Dimple in resized case

Post by Bills Shed » 11 Feb 2015, 4:57 am

Lube Detonation!!
I agree it is a new one on me. Another myth in the reloading world? Sometimes I think people are trying to over complicate a reasonably simple process with complex answers. Each step in the reloading process is reasonably basic. You can keep each step very simple and still keep it safe, or you can get right up to the OCD stage and have fantastic results. I am somewhere in the middle. Sometimes we all make mistakes and bend a few cases or seat a projectile poorly. We learn from the mistake and dont make it again.
I do not think we have to split the atom to find a solution for dimpled cases.
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Re: Dimple in resized case

Post by Warrigul » 11 Feb 2015, 7:55 am

Bills Shed wrote: Sometimes I think people are trying to over complicate a reasonably simple process with complex answers. Each step in the reloading process is reasonably basic.


+1
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Re: Dimple in resized case

Post by Usurper » 11 Feb 2015, 8:55 am

Bills Shed wrote:I do not think we have to split the atom to find a solution for dimpled cases.


I'll call the boys at the lab and tell them to cancel the project :lol:
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Re: Dimple in resized case

Post by Bills Shed » 11 Feb 2015, 8:04 pm

GPostal wrote:Seems fine, nothing unusual.
All good thanks - used less spray and gave them a good shake in the box afterwards and nomoredimples,
Thanks all


Good to hear that all is good.
Simple solution, safe outcome

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Re: Dimple in resized case

Post by Jack V » 11 Feb 2015, 8:08 pm

The solution was simple but is not the same thing as the cause !
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Re: Dimple in resized case

Post by sneaker » 13 Feb 2015, 10:31 am

GPostal wrote:All good thanks - used less spray and gave them a good shake in the box afterwards and nomoredimples,


Cool :thumbsup:

I've had this happen a few times too, guess I know what I did wrong now.
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Re: Dimple in resized case

Post by MakeItHappenCaptain » 05 Apr 2015, 3:19 pm

My first set did the same. Now using a lube pad with Dillon spray. Shake before use, only spray the body,not the necks and wait a few seconds for the alcohol to evaporate. Roll the cases to distribute it lightly and evenly on the body and dip the neck in a dry lubricant before sizing. Have heard of graphite in a jar of lead shot with a shake every few dips to recoat the shot in graphite. I am just using the mica powder that came with an RCBS case mate.

Also check the pressure hole in the die isn't obscured. RCBS resizing dies for example have a small hole in the side of the thread to allow air trapped to escape during the upstroke. This hole may have crap in it from manufacture. A paper clip is the right size to clean it out if obstructed, but my locking ring sits right over it and I don't get the full air flow, however has been no dramas so far.

PS, don't chuck the dimpled cases. As long as the case isn't creased (and mine weren't as bad as the photo) they should fire form back into shape in the chamber and you'll be right.
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Re: Dimple in resized case

Post by Jack V » 06 Apr 2015, 12:34 pm

Bills Shed wrote:Lube Detonation!!
I agree it is a new one on me. Another myth in the reloading world? Sometimes I think people are trying to over complicate a reasonably simple process with complex answers. Each step in the reloading process is reasonably basic. You can keep each step very simple and still keep it safe, or you can get right up to the OCD stage and have fantastic results. I am somewhere in the middle. Sometimes we all make mistakes and bend a few cases or seat a projectile poorly. We learn from the mistake and dont make it again.
I do not think we have to split the atom to find a solution for dimpled cases.

I suggest you look it up first before you open your mouth .
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Re: Dimple in resized case

Post by tom604 » 06 Apr 2015, 1:21 pm

just got off google, :thumbsup: , nothing on lube detonation :unknown: perhaps you can put a link up jack? with pics or it has never happened :P
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