Peterson Brass

[D Scott]

I recently purchased some Peterson brass in 7 PRC for a custom build on a Defiance action. I have been measuring neck wall thickness variation between 12.5 thou to 16 thou, with the bulk falling within 13-15+ thou , on each case, a minority of the cases were 1 thou or better.
I have taken off any burrs on the case mouth prior to measuring on a ball micrometer made for this operation.
I have measured several after putting them on a .284 mandrel , which changed the overall numbers but the variation was still present. I called Peterson , they told me I was measuring wrong, but I get consistent measurements on my lapua brass, all under .001", and my RP brass consistently under .002"
So basically no love from Peterson, just wondering if anyone else is see numbers like this. I usually try to neck turn the high side off to clean the necks up a bit to keep the ES and runout down
Any thoughts?
Thanks in advance

 

[josh_127]

With all my Peterson brass I've been extremely pleased the consistency... usually never more than a .005 thickness difference...I have 6xc SRP, 300 win mag long, and basic belted brass I turned into 7mm stw.

 

[FEENIX]

I recently purchased some Peterson brass in 7 PRC for a custom build on a Defiance action. I have been measuring neck wall thickness variation between 12.5 thou to 16 thou, with the bulk falling within 13-15+ thou , on each case, a minority of the cases were 1 thou or better.
I have taken off any burrs on the case mouth prior to measuring on a ball micrometer made for this operation.
I have measured several after putting them on a .284 mandrel , which changed the overall numbers but the variation was still present. I called Peterson , they told me I was measuring wrong, but I get consistent measurements on my lapua brass, all under .001", and my RP brass consistently under .002"
So basically no love from Peterson, just wondering if anyone else is see numbers like this. I usually try to neck turn the high side off to clean the necks up a bit to keep the ES and runout down
Any thoughts?
Thanks in advance

If those measurements are on virgin brass, they will change once fire-formed from the rifle's chamber. But don't take my word for it. Since you already have the measurements, re-measure after they are fire-formed from the chamber and see for yourself. Regardless of brand, I do not do my load development unless my brass has been fire-formed from the chamber. Good luck!

With all my Peterson brass I've been extremely pleased the consistency... usually never more than a .005 thickness difference...

Ditto!

 

[coyotezapper]

If those measurements are on virgin brass, they will change once fire-formed from the rifle's chamber. But don't take my word for it. Since you already have the measurements, re-measure after they are fire-formed from the chamber and see for yourself. Regardless of brand, I do not do my load development unless my brass has been fire-formed from the chamber. Good luck!

Ditto!

^^ THIS ^^

 

[Teri Anne]

I recently purchased some Peterson brass in 7 PRC for a custom build on a Defiance action. I have been measuring neck wall thickness variation between 12.5 thou to 16 thou, with the bulk falling within 13-15+ thou , on each case, a minority of the cases were 1 thou or better.
I have taken off any burrs on the case mouth prior to measuring on a ball micrometer made for this operation.
I have measured several after putting them on a .284 mandrel , which changed the overall numbers but the variation was still present. I called Peterson , they told me I was measuring wrong, but I get consistent measurements on my lapua brass, all under .001", and my RP brass consistently under .002"
So basically no love from Peterson, just wondering if anyone else is see numbers like this. I usually try to neck turn the high side off to clean the necks up a bit to keep the ES and runout down
Any thoughts?
Thanks in advance

I am just starting on a project to determine if the life of premium brass (in this case Peterson) would last longer to justify the excessive price one has to pay for it. I am doing .308 loaded to my usual target velocities, Peterson vs Lake City Military Brass. So far the thickness of the case necks vary by .002 to in some cases .003. When running the new Petersons through the sizing die it took a lot more pressure to do the initial sizing which leads me to believe that perhaps they were a bit large to begin with. I didn't think to try chambering prior to sizing, but it might have proved to be interesting. The overall length was remarkably consistent, less than .0005 variance, but then again, so was the Lake City. The initial project was to test case life, now with the case neck issues I will be watching accuracy closely too. More to come as the project moves on, but so far I am not impressed.

 

[D Scott]

With all my Peterson brass I've been extremely pleased the consistency... usually never more than a .005 thickness difference...I have 6xc SRP, 300 win mag long, and basic belted brass I turned into 7mm stw.

Thanks for the feedback, do you mean .0005" ?

 

[VarmintBob]

I recently purchased some Peterson brass in 7 PRC for a custom build on a Defiance action. I have been measuring neck wall thickness variation between 12.5 thou to 16 thou, with the bulk falling within 13-15+ thou , on each case, a minority of the cases were 1 thou or better.
I have taken off any burrs on the case mouth prior to measuring on a ball micrometer made for this operation.
I have measured several after putting them on a .284 mandrel , which changed the overall numbers but the variation was still present. I called Peterson , they told me I was measuring wrong, but I get consistent measurements on my lapua brass, all under .001", and my RP brass consistently under .002"
So basically no love from Peterson, just wondering if anyone else is see numbers like this. I usually try to neck turn the high side off to clean the necks up a bit to keep the ES and runout down
Any thoughts?
Thanks in advance

you have to use a ball micrometer. Your measurements are probably affected by the mouth edges. I use Peterson and Lapua brass. Peterson is, by far, higher quality.

 

[D Scott]

you have to use a ball micrometer. Your measurements are probably affected by the mouth edges. I use Peterson and Lapua brass. Peterson is, by far, higher quality.

Yes I have a ball micrometer and I clean up the mouth edges prior to measuring as stated above, my lapua our of the box is .oo1 or less

 

[Huntaddict]

I recently purchased some Peterson brass in 7 PRC for a custom build on a Defiance action. I have been measuring neck wall thickness variation between 12.5 thou to 16 thou, with the bulk falling within 13-15+ thou , on each case, a minority of the cases were 1 thou or better.
I have taken off any burrs on the case mouth prior to measuring on a ball micrometer made for this operation.
I have measured several after putting them on a .284 mandrel , which changed the overall numbers but the variation was still present. I called Peterson , they told me I was measuring wrong, but I get consistent measurements on my lapua brass, all under .001", and my RP brass consistently under .002"
So basically no love from Peterson, just wondering if anyone else is see numbers like this. I usually try to neck turn the high side off to clean the necks up a bit to keep the ES and runout down
Any thoughts?
Thanks in advance

I use Peterson in my 7/300 PRC - thickness was .014 to .015 which is pretty good. There may be outliers here and there but if you are getting 90% of your cases within .0015 or .002, that's not bad - I trim nearly every single one anyway to ensure they are all to spec I want

 

[Flea21]

you have to use a ball micrometer. Your measurements are probably affected by the mouth edges. I use Peterson and Lapua brass. Peterson is, by far, higher quality.

Agreed and it's made in the USA so that seals the deal right there!

 

[emp1953]

I am just starting on a project to determine if the life of premium brass (in this case Peterson) would last longer to justify the excessive price one has to pay for it. I am doing .308 loaded to my usual target velocities, Peterson vs Lake City Military Brass. So far the thickness of the case necks vary by .002 to in some cases .003. When running the new Petersons through the sizing die it took a lot more pressure to do the initial sizing which leads me to believe that perhaps they were a bit large to begin with. I didn't think to try chambering prior to sizing, but it might have proved to be interesting. The overall length was remarkably consistent, less than .0005 variance, but then again, so was the Lake City. The initial project was to test case life, now with the case neck issues I will be watching accuracy closely too. More to come as the project moves on, but so far I am not impressed.

Teri, Try a batch of Starline Brass. I have changed over to all Starline, I am really happy with their consistency. I don't chase highest velocity or pressure, just what works. I have a control group of .270win brass of 20 cases that now have 9 loadings on them, no signs of distress anywhere. Neck tensions are still good. primer pockets good, I haven't had to trim length either.

 

[Teri Anne]

Teri, Try a batch of Starline Brass. I have changed over to all Starline, I am really happy with their consistency. I don't chase highest velocity or pressure, just what works. I have a control group of .270win brass of 20 cases that now have 9 loadings on them, no signs of distress anywhere. Neck tensions are still good. primer pockets good, I haven't had to trim length either.

Starline and Winchester are my usual go to brass. I have found them, so far, to be more consistent than the Peterson. I usually get 4 to 7 loads out of a case, sometimes up to 9 on Lake City military brass.

 

[bonie]

I just bought some .308 tare downs I was lead to believe were Laputa, the were head stamped NT so I inquired and was told they were Nammo Tactical made in Norway. they look and measure the same as Lapua. I did some research and Nammo pretty much owns Lapua. Anyone herd of them before?

 

[FEENIX]

I just bought some .308 tare downs I was lead to believe were Laputa, the were head stamped NT so I inquired and was told they were Nammo Tactical made in Norway. they look and measure the same as Lapua. I did some research and Nammo pretty much owns Lapua. Anyone herd of them before?

Yes, and it has been as such for a while now.