The 6UM

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I believe the earlier confusion is that if a 6um is already doing a 115 @3500 a steel 6um case doing the same is changing nothing

What may change something is if a smaller case can do the same, but then it’s not a 6um.

Maybe a steel 6um can do 3700
 

WyoWild

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Oct 26, 2021
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I wonder if the relationship between pressure and recoil is linear? I would assume it would be for the most part but wonder if anyone with an engineering background could shed more light on the subject?

Undoubtably a high pressure alloy case is going to have more recoil than the same case brass case. I don't really have an interest in a magnum based alloy mega-pressure case as I just don't need that kind of velocity for the hunting I do. However it could be intriguing to see what type of performance you could get with an alloy case in Creedmoor or .308 based cases. Full 24" performance in a 16" barrel in those cases would have a market for sure.
 

GoatPackr

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The primer isn’t an issue. The Sig Fury is ran over 85,000 PSI with standard primers.

I never thought about that. When modern primer fails how does it fail? I've had them pop out of the case so a suppose if the case could hold the primer then the primer should handle more pressure?
 

gabenzeke

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Oct 28, 2015
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I wonder if the relationship between pressure and recoil is linear? I would assume it would be for the most part but wonder if anyone with an engineering background could shed more light on the subject?

Undoubtably a high pressure alloy case is going to have more recoil than the same case brass case. I don't really have an interest in a magnum based alloy mega-pressure case as I just don't need that kind of velocity for the hunting I do. However it could be intriguing to see what type of performance you could get with an alloy case in Creedmoor or .308 based cases. Full 24" performance in a 16" barrel in those cases would have a market for sure.
This is what I thought...3k fps from a 6 cm and 109 eldm or something like that from a super short barrel would be interesting.

Sent from my Pixel 6 Pro using Tapatalk
 

Formidilosus

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Shoot2HuntU
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I never thought about that. When modern primer fails how does it fail? I've had them pop out of the case so a suppose if the case could hold the primer then the primer should handle more pressure?

Yes. Or you get a pierced primer, but thicker cups can handle that.

The brass case head is the main issue with pressures.
 
Joined
Dec 23, 2020
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Yes. Or you get a pierced primer, but thicker cups can handle that.

The brass case head is the main issue with pressures.

The hole size in the bolt face for the firing pin is a factor in piercing primers too. If the hole is big relative to the firing pin, the primer is more likely to extrude into the hole and at some point in the pressure curve, may punch out a disk of the primer cup into the bolt (AKA blanking the primer). The higher the pressure the cartridge is loaded to, the more this is an issue. I have had to have a firing pin hole bushed on a match action because it was blanking primers on some loads.
 

khuber84

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Jun 6, 2019
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This is what I thought...3k fps from a 6 cm and 109 eldm or something like that from a super short barrel would be interesting.

Sent from my Pixel 6 Pro using Tapatalk
A 109 at 3050 with rl26 from my 18in barrel still recoils less than a 6prc of similar weight with a 112 at 3120 in my observations. Talking 45gr VS 58 gr powder.
 

gabenzeke

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Oct 28, 2015
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A 109 at 3050 with rl26 from my 18in barrel still recoils less than a 6prc of similar weight with a 112 at 3120 in my observations. Talking 45gr VS 58 gr powder.
That's a 6 creedmore? Don't want to use rl26, but those are awesome numbers from an 18 inch barrel

Sent from my Pixel 6 Pro using Tapatalk
 

khuber84

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Jun 6, 2019
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At least the brass is a bargain.
It shouldn't be much more than regular Saum Adg brass should it? There is a lil more margin on it due to scrap rate. But you're still paying $2.30/piece of brass. Thats still on the highest end of spectrum for brass from large scale manufacturer. Lapua 300 norma is cheaper than that, and it's some the toughest brass there is.
 

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