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#5838746 - 07/19/15 05:43 PM Too much pressure
MathMan Offline
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Registered: 07/24/10
Posts: 1558
Loc: South Texas
I reloaded some 243 ammo and was wondering if this is signs of too much pressure?
The first two pics are of factory federal ammo to compare. The second toe are of my loads shot once. I only neck sized them.





Notice the ring at the bottom of each case. Why is it on the factory round too? It is hard to see but the reloaded round is more of a ring but it had a slight ring the first time.
Are the primers ok? Do they show signs of over pressure? Can I
safely neck size them again and reload again?

Fyi: it says ifunny because I used the app to add the writing on the pics.
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#5838863 - 07/19/15 07:19 PM Re: Too much pressure [Re: MathMan]
syncerus Offline
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Registered: 12/01/08
Posts: 1991
Loc: Dallas, TX
Questions like this are why every serious reloader needs to own a chronograph. Velocity never lies.
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#5838903 - 07/19/15 08:08 PM Re: Too much pressure [Re: MathMan]
jbd76266 Online   content


Registered: 04/17/09
Posts: 4365
Loc: Sanger, TX
It's not in itself a high pressure sign. Your primers look fine. Reload and shoot. If your worried about case head separation you can check the inside with a paperclip, bit you won't show any sign in those cases


Edited by jbd76266 (07/19/15 08:09 PM)

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#5838906 - 07/19/15 08:14 PM Re: Too much pressure [Re: MathMan]
MathMan Offline
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Registered: 07/24/10
Posts: 1558
Loc: South Texas
I did the paper clip check and all is good. Does the bulge in the case affect accuracy? I'm only neck sizing.
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#5838926 - 07/19/15 08:32 PM Re: Too much pressure [Re: MathMan]
FiremanJG Offline
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Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
I see no signs of pressure. No extractor swipes, no flow back on the primers. Most of my loads have a tad of flowback on the primers and have for thousands of rounds.

Quit neck sizing if you want those cases to continue to chamber and to eject after firing. Eventually they will get too long and jam in the chamber.

Partial FL size .002" less than the fired length every time you size.
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#5838978 - 07/19/15 09:19 PM Re: Too much pressure [Re: syncerus]
Dave3575 Offline
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Registered: 02/12/12
Posts: 1019
Loc: Plano, TX
Originally Posted By: syncerus
Questions like this are why every serious reloader needs to own a chronograph. Velocity never lies.


why is that?

velocity has nothing to do with the case experiencing over pressure issues.... sure they may run faster at higher pressures but you can also get pressure signs and have failures for many, many other reasons at expected velocity numbers...

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#5839024 - 07/19/15 09:58 PM Re: Too much pressure [Re: MathMan]
syncerus Offline
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Registered: 12/01/08
Posts: 1991
Loc: Dallas, TX
Pressure indicators can vary because of differing brass hardness, quality, thickness, chamber dimensions, primer characteristics, etc. I agree that velocity, in and of itself, is not the be all and end all of pressure determination. That said, when using common components in reasonable and customary ways, velocity is a very useful and accurate indicator of pressure, independent of other considerations. It's also the most obvious sign of pressure indications when using unfamiliar components.


Edited by syncerus (07/19/15 10:10 PM)
Edit Reason: A a a
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#5839370 - 07/20/15 09:14 AM Re: Too much pressure [Re: MathMan]
redchevy Online   content
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Registered: 10/25/04
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I loaded my first batch of ammo and took them to my great uncle to see what he thought. He said they look like bullets, what did you put in them?

So ill ask... what did you put in them? Are you concerned about pressure for one reason or other? They look fine to me.
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#5839437 - 07/20/15 10:07 AM Re: Too much pressure [Re: MathMan]
Strongbad Offline
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Registered: 02/04/10
Posts: 447
The ring on the case is from the chamber and the cases forming to it. I have more than a couple of factory rifles that do the same thing. Pretty common. It's hard to tell from the pictures but I don't really see any cratering on those primers either. I don't really consider that a reliable measure, but nonetheless even if it's an indicator you don't appear to have any.

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#5839703 - 07/20/15 01:10 PM Re: Too much pressure [Re: MathMan]
papa45 Offline
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Registered: 05/14/07
Posts: 472
Loc: Arlington
The ring/bulge you see is normal from the case swelling into the chamber, as Strongbad said. The web doesn't expand much, except under extreme pressure, but the thinner case wall does, creating the bulge. Incipient case separation will show as a thin bright ring about 1/8 to 1/4 inch above the bulge ring you are now seeing and it can usually be felt on the inside with the paper clip check. Discard any cases like that.

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#5842312 - 07/21/15 11:43 PM Re: Too much pressure [Re: redchevy]
MathMan Offline
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Registered: 07/24/10
Posts: 1558
Loc: South Texas
Originally Posted By: redchevy
I loaded my first batch of ammo and took them to my great uncle to see what he thought. He said they look like bullets, what did you put in them?

So ill ask... what did you put in them? Are you concerned about pressure for one reason or other? They look fine to me.


Imr 4350 powder. 42.1grains.
100 grain Speer BTSP Bullets
CCI 200 primers
Factory length

I used an old reloading manual from my FIL. Then I looked online and the new ones say that's over max.
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#5843061 - 07/22/15 01:04 PM Re: Too much pressure [Re: MathMan]
papa45 Offline
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Registered: 05/14/07
Posts: 472
Loc: Arlington
That might be a little heavy, or maybe not. Your brass and primers look OK to me. A couple of my reloading manuals say 41.4 or 41.5 gr max for IMR 4350. I personally am loading 41.2 to 41.7 gr IMR 4350 under a Hornady 100 gr BTSP. You may want to back off a bit to reduce wear and tear on your brass and barrel.

I have noticed two things that factor into deciding on a powder charge. 1. Reloading manuals are getting more conservative, no doubt to mitigate liability for the powder and bullet manufacturers. 2. I have been using IMR 4350 for over 30 years and each new batch I buy seems to be a bit slower than the last, so my charge weights keep creeping up.

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#5843153 - 07/22/15 01:50 PM Re: Too much pressure [Re: MathMan]
MathMan Offline
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Registered: 07/24/10
Posts: 1558
Loc: South Texas
I'm ok with the wear on the brass. I don't shoot much. I should be good for 3 years with what I have loaded now.

Thanks for the help everyone. I learned a lot in this topic.
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#5844386 - 07/23/15 10:13 AM Re: Too much pressure [Re: MathMan]
redchevy Online   content
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Registered: 10/25/04
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Loc: Texas
My speer manual lists max at 42.0 gr.

So long as all looks ok your probably fine.
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