The Flint&Fly Guy
Member
- Location
- Northern Alberta
Pressure sign help
- Thread starter The Flint&Fly Guy
- Start date
From your pics, IMHO, you don't have an incipient pressure issue going on.
There may be something in your chamber causing those rings.
The area you show is part of the thickest section of the case it should be OK.
Are you full length resizing????
Have you used a pick to feel down inside for checking the area of concern??
If I were concerned, I would cut a case in half, lengthways, so I could get a good visual look at the area of concern. This is likely the most definitive method to check this situation out.
There may be something in your chamber causing those rings.
The area you show is part of the thickest section of the case it should be OK.
Are you full length resizing????
Have you used a pick to feel down inside for checking the area of concern??
If I were concerned, I would cut a case in half, lengthways, so I could get a good visual look at the area of concern. This is likely the most definitive method to check this situation out.
In many rifles the very rear of the case is not supported by the chamber, and with hotter loads the base of the case outside the chamber can expand.
The exaggerated image below shows this base expanshion and it can be measured just above the extractor groove. Meaning a hot load stressing the brass beyond its elastic limits.
Your marks on the cases could also be caused by a sharp edge around the mouth or further inside of the chamber. Or it could also be cause by your resizing die and pushing up a small ridge of brass on the case.
Simple Trick for Monitoring Pressure of Your Rifle Reloads
http://www.hodgdonreloading.com/reloading-education/tips-and-tricks/simple-trick-monitoring-pressure-your-rifle-reloads
The exaggerated image below shows this base expanshion and it can be measured just above the extractor groove. Meaning a hot load stressing the brass beyond its elastic limits.
Your marks on the cases could also be caused by a sharp edge around the mouth or further inside of the chamber. Or it could also be cause by your resizing die and pushing up a small ridge of brass on the case.
Simple Trick for Monitoring Pressure of Your Rifle Reloads
http://www.hodgdonreloading.com/reloading-education/tips-and-tricks/simple-trick-monitoring-pressure-your-rifle-reloads
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Finger Toes
Regular
- Location
- Yellowhead County
You can sacrifice a case or two and cut it in half long ways with a hacksaw or disc to see if the cases are thinning out in that area
I have seen alot worse pressure rings.
If your primer pockets are tight, and your primers look o.k no cratering/ extremely flat, cratering, leakage.
No hard ejection, or ejector marks on brass.
I wouldn't worry too much.
If your primer pockets are tight, and your primers look o.k no cratering/ extremely flat, cratering, leakage.
No hard ejection, or ejector marks on brass.
I wouldn't worry too much.
thatmikeguy
Regular
- Location
- Steinbach, Manitoba
I would agree with the previous 2 posts.
An easy way to check though is to peak inside with a flash light. A case head separation grove will be there along with a bright ring on the outside and can be felt on the inside with a paper clip.
My 243 brass has lines on the outside just from the sizing die.
An easy way to check though is to peak inside with a flash light. A case head separation grove will be there along with a bright ring on the outside and can be felt on the inside with a paper clip.
My 243 brass has lines on the outside just from the sizing die.
thatmikeguy
Regular
- Location
- Steinbach, Manitoba
Lee RGB.
Good to know...see in your bottom pic, it looks like it has a belt like a magnum...I've only seen that with Hornady dies to date, the lip of the die is left pretty square and it shaves brass leaving a mark like that.
Falconflyer
CGN Ultra frequent flyer
I keep a few inch long piece of coat hanger wire in my reloading bench. It has a small blunt point bent over at the end and is perfect for reaching inside of a case to feel for a ring near the base of the case. With a bit of practice you can check for incipient case head failure in a few seconds. Even if I don't suspect a ring is starting to form, I'll spot check a few cases in each lot that I reload just for peace of mind.
thatmikeguy
Regular
- Location
- Steinbach, Manitoba
I thought you were asking me but I'm not the original poster. I don't know which dies he uses.
Easiest way to check cases for rings is definitely with a paperclip, straighten it, put a 1/8" or so, 90deg bend on one end (the sharpest one if there is any difference), bend the other end to use as a handle. Scrape from the base up, you will feel the ring divot before they show outside the case. Usually see the ring a shot or two after you can feel it. The OP's case looks like a resizing or chamber mark, most likely a die.
I agree 100%, you must be almost as smart, good looking and modest as I am.
Below the OP cases and I also believe that it is a die or chamber mark.
Below is what a partial case head separation looks like and it is further up the case where the brass is thinner and not just above the extractor groove.
The Flint&Fly Guy
Member
- Location
- Northern Alberta
Lots of interesting replies. Thanks.
I would say probably die marks, Not from my dies though, I loaded those with a borrowed set of hornady dies, any that i have done with my new rcbs set do not aquire that mark.
I would say probably die marks, Not from my dies though, I loaded those with a borrowed set of hornady dies, any that i have done with my new rcbs set do not aquire that mark.
I agree 100%, you must be almost as smart, good looking and modest as I am.
I'm not sure if that's a compliment or an insult. Well done.
