Argentino Model 1891

[Art Eatman]

Generally, single-lug bolts are limited to 40,000 psi. Double-lug, around 50,000 psi.

IIRC, 50,000 psi is around 55,000 CUP, roughly. Loading data books show many very-effective loads in the 48,000 CUP pressure range, which should be safe in any double-lug bolt.

 

[R.W.Dale]

IIRC, 50,000 psi is around 55,000 CUP, roughly.

Making such rule of thumb cup psi conversios are unreliable in the extreme and can result in very nasty outcomes. CUP cannot be used to reliably make calculations of firearm strength because depending on the cartridge cup isn't the same pressure at the same value.

example 50,000 CUP for 280 rem = 62,000 psi
but for 308 50,000 CUP = only 60,000 psi
and for .223 52,000 CUP = a mere 55,000 psi

A psychical universe where the math of CUP could work out would be a wacky place indeed.

 

[Slamfire]

Small ring mausers have been extensively tested for their strength.

http://img382.imageshack.us/i/3082pc6.jpg/

Maximum pressure 390.00 MPa (56,565 psi)

Inspite of Garry James doing an outstanding job of shilling for SAMCO, "extensively tested" here is a report on one of those M1916's that developed excessive headspace.


http://www.thehighroad.org/showthread.php?t=530130

Oceans - It is true, as I found out today, sadly.

I've had my 1916 Spanish Guardia Mauser from Samco for about 20 years now. Took it deer hunting every year until last year, when I heard about the same thing you did. I shot .308 rounds out of it.

Finally got the headspace checked by a gunsmith, and - well, the bolt locked EASILY on "no-go". And we're talking like butter. I snapped the firing pin and will have it hanging on the wall of my office soon.