Discussion in 'Main Message Board' started by grovey, Jan 24, 2020.
Wonder if that brass is going to be like the novx cases that are similar construction and not able to be reloaded? I guess the lapua folks have already figured out how to contain that pressure in their 220russian cases.
Just think an 80,000 PSI Explosion Right next to Your Temple. hmmm.
If you don't mind, I'll let everyone else test those things out BEFORE I give them a try. Thank you very much. That is all.
How much pressure can the receiver hold ?
I saw something where Daniel Horner said that once handloaders got their hands on this brass he expects to see "game changing" things
Interesting. Time will tell.
Earl Cronister used these at PA 1000 club back in the 80's gave one to my brother he shot the same one 70x steel head..the steel insert screwed into the brass, the walls were thick I forgot about how much capacity loss was..300 whby mag
That is a pretty interesting concept. I'm guessing these are 'one and done' casings though. Not sure how you'd size the base of the case with a stainless web, nor how you'd monitor the integrity of the brass in their 'mechanical lock'.
As far as pressures, 80k PSI isn't blowing up any modern bolt actions.
I seriously doubt the base is growing at all.
80,000 psi is still high.
Lazzeroni tested a large shank Savage. It finally deformed at 120,000 psi, but didn't "explode".
I imagine you could neck size.
A lot more than 80.
Granted it's a Mark V, they were testing them up to like 150k+ with the 378 based cartridges.
I've calculated the stresses in the barrel tenon using Lame's equations (for you engineers out there you can't use hoop stress in a thick walled cylinder). for the large calibers in a 1 1/16 threaded tenon, there isn't the margin I'm used to seeing in the nuclear industry. So I concluded we have overwhelming experimental data that there is adequate design for traditional cartridges up to and including 338LM.
So I wouldn't worry about 80KSI in 308 based cartridges. Magnum, I'd like to see others try it first and lapua based cartridges I'd be very leery of.
All that said, I believe the weakest link on a repeater action is the lower lug so I would expect to see some lugs moving at this pressure. Not a problem in a single shot.
So I'm a bit unsure if I trust this design. Eventually I'm sure case head separations will be seen either from excessive reloads or from defective construction. But with a steel pug in the base of the chamber, I think it is likely that injury will not be concern, especially if the chamber is cut tight to the base.
It’s been 35 years ago but I saw a guy loading a 700 7mm Rem Mag “half way up the neck with H322 because that’s what the bench rest shooters do.” He did it 3 times and it didn’t blow up. Somebody figure out how much pressure that was. I’m pretty sure he would have tried a fourth shot if I hadn’t stopped him.
Significantly more. The usual weak point in the firearm side is the barrel.
I do not think these are intended to be reloaded. If so, case life will be short. The weak point here is the aluminum “rivet” holding this together. At the pressures and flame temperatures, this rivet will flow and that may cause this “joint” to loosen.
135,000 PSI with 100 gr bullet.
Heavier bullets even more so.
Eons ago, a friend used to work for Remington as a design Engineer. He said the test lab would occasionally take a standard 3006 chambered 700, pound 3 220 grain bullets up the barrel until a regular 220 grain proof load could be chambered. Then they would fire it in a steel tube to contain all the debris. 100 percent of the time the receiver and bolt would be Undamaged. The stock would be splinters and the case would flow like it was melted. They estimated the pressures at “above 120000”
Yes they were called steel heads you bought the basic "head" ala magnum or 308 and the body threaded to it and you could form whatever you wanted...
I know they were saying at SHOT that the cartridge is in fact reloadable but wouldn’t say how.
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