Does it?
6.5 creed magnum
- Thread starter Casscade
- Start date
I'll just park this right here…
Could you… maybe. I'm not sure how/if geometry will change in dies designed specifically for the + peak cases… but they are coming.
A couple things (not all encompassing) different with reloading for + peak:
- recommended not to trim/debur case mouths as this will remove the nickel plating, which protects the underlying case material.
- Case mouths need to be flared just enough to not scrape bullet jackets during seating.
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I've loaded the 7bc.
-Definitely need to lube the cases.
-A very slight flaring is helpful.
-Recommend getting a lee crimp die.
Not sure if the +Peak sizing dies are interchangeable. Probably not recommended by the manufacturer, but the cases are the same dimensions. Also guessing a collet neck sizer will work with these cases as they work well with the NAS3.
Mentioning only because I haven't seen it, but assuming the case can be resized, what is the case material's ability to be successfully resized in regards to hold uniform, concentric and repeatable neck tension, if so, does the case material "work-harden" if resized, and is there even an annealing process for the material to support the above, or is it even needed?
All these questions I mentioned is the reason I platformed off the Fury case
h_1ag
Well-Known Member
The two concepts are inseparable. For example- you obviously can't fit enough CFEBLK into the case to achieve anything remotely close to those pressures. So powder is absolutely a critical factor for achieving 80k psi. If you don't want to share insights, that's fine. But don't demean my question with obviously false statements.
A resounding … YES… to this statement…
On one of the NAS3 threads, someone posted the NAS3 case carried about 10% more powder than a brass 6.5 CM case.
After working with the 7bc case, my guess is the 6.5cm+Peak cases will have less capacity than the brass analog.
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So what is different about the + Peak cases?
According to Federal's managers or department heads (don't remember the names and titles) recent interview with Vortex's Mark and Ryan, on YouTube, the alloy case walls are thinner but other dimensions are identical to brass cases, implying more case volume in the steel cases, and the steel alloy cases do not expand and contract like brass, and this was the source of higher pressure without having any increase of pressure on the bolt face.
h_1ag
Well-Known Member
This really doesn't answer the same question from earlier: we already have a handful of powders that operate at +100% capacity in this cartridge. What powders are now introducing higher pressure without a sacrifice in accuracy?
Changes in capacity are going to be negligible. You're not getting +25% capacity from a thinner case wall. Probably ~5%.
So the obvious X factor here is that we're dealing with a powder that generates a lot more pressure/power using the same relative amount of volume.
What is it?
Pure speculation on my part. And likely incorrect.
I was comparing the 7bc to the 280 ai cases.
7bc = 74.6 gr h20
280ai = 76 gr h20
I do not have 280 rem to compare.
The NAS3 cases in 308 have about 10% more capacity than the brass analog.
I'll be getting the NAS3 6.5cm cases as soon as they are available again to make a comparison with all of them. Should be interesting.
10% is a notable difference. Even at the same pressure, you can achieve higher velocities.
As for accuracy, I was told by the Shell Shock guys that the consistency of the steel in the neck will keep the accuracy at higher pressure where the brass shows its inconsistencies as the pressures get closer to the physical limit.
Modeling any of these in GRT, can us to 80k with just a little more of the same powders, or possibly a slightly faster powder.
In 6.5 CM I will likely try H4350 first.
Less than 45gr H4350 in my batch of Starline brass can get to 80k with negligible compression.
