Theyhave to be proof fired in Europe with C.I.P. standards. SAAMI lists 14,000 psi (Piezo/transducer) and C.I.P. lists 16,000 psi. In reality, not really a lot of difference there between them. Stick with standard manual level loads for Colt revolvers. That level of loads will be a handful in that revolver.
Larry Gibson
“Deficient observation is merely a form of ignorance and responsible for the many morbid notions and foolish ideas prevailing.”
― Nikola Tesla
I’m looking at a .357 Mag Cimarron.
Yep it’s purdy!
My experience with bird’s head grips on a 327 Ruger Single 7 and the 357 Henry is they look way better than they perform. I find it hard to get exactly the same grasp, same position on the bird’s head frame and my groups show it. It’s also harder to keep the pistol from slipping my grasp (rolling up) under recoil. That also adds to bigger groups.
If you want to play with a bird’s head, I think you’ll have better luck with 357 than 45 Colt bc the gun will be a bit heavier. That’ll help a little in keeping the grip in your grasp.
I made a pair of stocks (grips) for my bird’s head Single 7 that are fuller and more squared across the rear. That helped a lot. I can hang on to it much better now and hit with it.
"Time and money don't do you a bit of good until you spend them." - My Dad
Nice job on those grips!
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That bump on the top of the grip might help with a consistent grip, but it might also hammer the thumb knuckle during recoil.
Larry Gibson
“Deficient observation is merely a form of ignorance and responsible for the many morbid notions and foolish ideas prevailing.”
― Nikola Tesla
Cimarron is really just an importer. Most all of their stuff is made in Italy by either Pietta or Uberti. As such, they're proofed to CIP standards.
Cimarron (Uberti or Pietta) are built and proofed to CIP standards. Here are C.I.P.'s pressure standard for the .357-
We have to convert the pressures from bar to PSI, so the .357 maximum average pressure as per C.I.P. is 3000 bar or 43,511 psi (bar x 14.5037738 = psi) (SAAMI pressure standards for the .357 Magnum is 35,000 psi) and those revolvers are proofed at about 56,500 psi. And some people think the Italian revolvers can't "take it"!
If you're interested in C.I.P.'s pressure standards, here's the link- C.I.P. Pressure Standards
35W
The biggest waste of time is arguing with the fool and fanatic who doesn't care about truth or reality, but only the victory of his beliefs and illusions.
There are people who, for all the evidence presented to them, do not have the ability to understand.
NRA Life Member
Larry Gibson
“Deficient observation is merely a form of ignorance and responsible for the many morbid notions and foolish ideas prevailing.”
― Nikola Tesla
The SAAMI proof round pressure for a 357 is 47,000 PSI minimum and 50,500 maximum. SAAMI, CIP and NATO EPVAT all measure at different points so all three will have different pressure readings for the same cartridge. Same for transducer PSI verse CUP.
https://saami.org/wp-content/uploads...12-13-2022.pdf page 168
https://www.gunsandammo.com/editoria...testing/458750
https://www.theballisticassistant.co...sure-pressure/
https://firearmshistory.blogspot.com...g-chamber.html
Last edited by M-Tecs; 09-11-2023 at 03:16 PM.
2nd Amendment of the U.S. Constitution. - "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
"Before you argue with someone, ask yourself, is that person even mentally mature enough to grasp the concept of different perspectives? Because if not, there’s absolutely no point."
– Amber Veal
"The Highest form of ignorance is when you reject something you don't know anything about".
- Wayne Dyer
The biggest waste of time is arguing with the fool and fanatic who doesn't care about truth or reality, but only the victory of his beliefs and illusions.
There are people who, for all the evidence presented to them, do not have the ability to understand.
NRA Life Member
Probably.
However, a pressure taken in one test barrel may not (more than likely won't) be the same as the pressure measurement of the same ammunition in another test barrel using wither SAAMI or C.I.P. methods. That is why "reference" ammunition is used to obtain a correction factor to validate the difference between test barrels. Some refer to this also as "calibration".
Larry Gibson
“Deficient observation is merely a form of ignorance and responsible for the many morbid notions and foolish ideas prevailing.”
― Nikola Tesla
As an fyi, and because I’m a big dork - ksi is a legitimate abbreviation for 1,000 psi. It’s in mechanical engineering textbooks.
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Thanks for pointing out the differences in the measurement systems. Don’t extrapolate SAAMI data up into CIP pressure ranges and pay attention when using Quick Load. I believe VV powders use CIP system, so I won’t use their data for an American made .357.
Understood.
So we circle back to the original question regarding Cimarron, or really, Italian revolvers and the pressure requirements for them. That would be C.I.P. with their pressure specifications for the .357 being ~43,500 psi and proof at 1.3x that or 56,550 psi.
35W
The biggest waste of time is arguing with the fool and fanatic who doesn't care about truth or reality, but only the victory of his beliefs and illusions.
There are people who, for all the evidence presented to them, do not have the ability to understand.
NRA Life Member
According to the Commission Internationale Permanente pour l’Epreuve des Armes ŕ Feu Portatives (C.I.P.), the maximum pressure specification for the .357 cartridge is 44,000 psi or 300 MPa 1. In C.I.P.-regulated countries, every pistol cartridge combination has to be proofed at 130% of this maximum C.I.P. pressure to certify for sale to consumers 1. Therefore, the proof pressure for the .357 cartridge is 57,200 psi or 395 MPa .
2nd Amendment of the U.S. Constitution. - "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
"Before you argue with someone, ask yourself, is that person even mentally mature enough to grasp the concept of different perspectives? Because if not, there’s absolutely no point."
– Amber Veal
"The Highest form of ignorance is when you reject something you don't know anything about".
- Wayne Dyer
BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |