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Shooting & Reloading - Mausers, Big Bores and others >> Rifles

DarylS
.700 member

Reged: 10/08/05
Posts: 27264
Loc: Beautiful British Columbia, Ca...

Re: A new type cartridge - 7mm Backcountry
13/01/25 12:30 PM

Suspect what you say about the future ctg. design is true, 85lc.
Steel bases allow higher pressures. As to the primer, that in itself is very important.
The mil. spec. 5.7x47? ctg. primers have harder cups to prevent slam firing in full auto rifles.
Seems to me, the mil. round generates around 57,000psi.
The .220 Swift of 1923?, generated some 62,000psi while the .22-250 Remington of 1965 was generating 65,000psi.
That's 60 years ago, now. 'Bout time something was developed producing more pressure. Just kidding. How much is needed?
Depends on who is buying, I guess.
The 8 MM Rem mag. also produced a suggested maximum pressure of 65,000psi in the States, but is listed as 67,000psi Pezio pressure in Europe.
The .300 Lap Mag. is listed highest of the current rounds at 68,000PSI - CIP.
We know that standard magnum primers used today, handle these pressures just fine - BUT - will they handle even higher pressures? 80,000psi? yikes - maybe?

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

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Subject	Posted by	Posted on
A new type cartridge - 7mm Backcountry	85lc	11/01/25 06:07 AM
Re: A new type cartridge - 7mm Backcountry	85lc	11/01/25 06:15 AM
Re: A new type cartridge - 7mm Backcountry	93x64mm	11/01/25 06:47 AM
Re: A new type cartridge - 7mm Backcountry	Hunter4752001	11/01/25 08:51 AM
Re: A new type cartridge - 7mm Backcountry	NitroX	12/01/25 06:29 PM
Re: A new type cartridge - 7mm Backcountry	DarylS	13/01/25 06:21 AM
Re: A new type cartridge - 7mm Backcountry	85lc	13/01/25 09:04 AM
Re: A new type cartridge - 7mm Backcountry	Rule303	13/01/25 01:47 PM
Re: A new type cartridge - 7mm Backcountry	NitroX	14/01/25 12:51 AM
Re: A new type cartridge - 7mm Backcountry	3DogMike	14/01/25 01:23 PM
Re: A new type cartridge - 7mm Backcountry	NitroX	14/01/25 08:17 PM
Re: A new type cartridge - 7mm Backcountry	DarylS	13/01/25 12:30 PM
Re: A new type cartridge - 7mm Backcountry	Marrakai	11/01/25 12:10 PM
Re: A new type cartridge - 7mm Backcountry	NitroX	12/01/25 06:31 PM
Re: A new type cartridge - 7mm Backcountry	3DogMike	13/01/25 05:41 AM
Re: A new type cartridge - 7mm Backcountry	DarylS	12/01/25 07:06 AM

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