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Joined: Mar 2005
Posts: 4,999
Campfire Tracker
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OP
Campfire Tracker
Joined: Mar 2005
Posts: 4,999 |
Anyone know what the SAAMI/CIP failure pressure the M760 is rated at?
Link?
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Joined: May 2010
Posts: 7,336
Campfire Tracker
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Campfire Tracker
Joined: May 2010
Posts: 7,336 |
The M760 was chambered for the 270 Win. Saami 65,000 psi.
"When the going gets weird, the weird turn pro." Hunter S. Thompson
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Joined: Dec 2014
Posts: 9,059
Campfire Outfitter
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Campfire Outfitter
Joined: Dec 2014
Posts: 9,059 |
Just a guess, but in addition to the .270 was the .244/6mm Rem. I'd guess the kitchen table handloaders probably stoked that cartridge well above SAAMI.
Well this is a fine pickle we're in, should'a listened to Joe McCarthy and George Orwell I guess.
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Joined: Feb 2003
Posts: 8,833
Campfire Outfitter
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Campfire Outfitter
Joined: Feb 2003
Posts: 8,833 |
I've had several M760 in both 270 and 30-06. I shot 100s of warm handloads in them without issue.
Adversity doesn't build character, it reveals it.
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Joined: Jun 2002
Posts: 11,944
Campfire Outfitter
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Campfire Outfitter
Joined: Jun 2002
Posts: 11,944 |
I've had several M760 in both 270 and 30-06. I shot 100s of warm handloads in them without issue. Yup and SB dies are not required. Reg FL resizing has worked fine for me in the past.
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Joined: Jul 2001
Posts: 60,054
Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,054 |
All of the above has been my experience as well, in 760s that have included a .270, .30-06 and .35 Whelen.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Joined: Dec 2004
Posts: 291
Campfire Member
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Campfire Member
Joined: Dec 2004
Posts: 291 |
I know of one person who blew up a 760. he sent the gun to Remington and their reply was the action was sprung out and not repairable an obvious overload. it was a 270 with 130 gr and imr 4320. it was estimated to exceed 80,000 psi. he admitted to a mistake to me years later. no injury but blew out through the magazine a spread the action noticeably. This happened probably, 50 years ago
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Joined: May 2002
Posts: 9,964
Campfire Outfitter
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Campfire Outfitter
Joined: May 2002
Posts: 9,964 |
When Remington stopped production of the M141 and brought out the M760 a few were made in 300H&H caliber but never made it past the R&D processing
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Joined: Jul 2005
Posts: 6,750
Campfire Tracker
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Campfire Tracker
Joined: Jul 2005
Posts: 6,750 |
SAAMI max for the 300 H&H is 54,000 PSI, 11,000 less than the 270.
Old Corps
Semper Fi
Get off my lawn.
FJB
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Joined: Jul 2001
Posts: 60,054
Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,054 |
No, the standard maximum for the .300 H&H is 54,000 CUP--copper units of pressure, which is a different thing than PSI, since it's tested electronically rather than with copper crushers.
The maximum average SAAMI PSI for the .300 H&H is 58,000 PSI--still less than the .270's, but not as much.
Based on considerable experience with the .300 H&H I would guess the big difference was NOT the pressure, but the tapered .300 H&H case. It was originally designed to allow easier extraction in bolt-action rifles with very temp-sensitive Cordite powder. In fact, original British ammo often came in two versions, a max-pressure loading for "normal" temperatures (basically the British isles), and a tropical version for the hotter parts of the Empire.
Post-WWII American powders were far less temp-sensitive than Cordite, but not nearly as many made today. I would guess the tappered .300 H&H case did not always extract well in the 760 action, at least partly due to temperature.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Joined: Dec 2002
Posts: 32,124
Campfire 'Bwana
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Campfire 'Bwana
Joined: Dec 2002
Posts: 32,124 |
When Remington stopped production of the M141 and brought out the M760 a few were made in 300H&H caliber but never made it past the R&D processing Source?
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