Just have a quick question for those more familiar with the revolver than I. Can you direct me to a reference or test report that would provide designed operating pressure and safety margin for the .460 round. I have read that the max operating pressure is 65,000 psi with cartridge pressures normally loaded to about 56,000 psi. Thanks
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Design pressure of S&W .460 Magnum
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roscoepc
Member
60,000psi on the X-Frames is what I have read but after a quick check on Wikipedia, 65,000 is what is said there... If you stay at about 50,000psi you should be well within the safety limits of the gun...
https://en.wikipedia.org/wiki/.460_S&W_Magnum
https://en.wikipedia.org/wiki/.460_S&W_Magnum
ruggyh
SWCA Member
You are correct, MOP can be verified with SAAMI.
MAP is usually set 15% below MOP by most manufactures to account for the multitude of variables that can be found in the firearms industry.
Be safe
Ruggy
My experience with modern firearms indicates that manufacturers maintain at least a 50% margin to failure pressure(~130,000 psi). That is exceeding the elastic limits of the cylinder wall causing deformation. If this is true, the .460 Magnum is an extraordinarily strong gun.
Nemo288
Member
Being "extraordinarily strong" does not mean "foolproof".
I urge anyone reloading for the higher pressure revolvers to follow the same common sense we all should.
Stick to published data. Work up loads slowly. PAY ATTENTION to any signs of pressure or problems.
The following I blatantly stole from John Ross:
I urge anyone reloading for the higher pressure revolvers to follow the same common sense we all should.
Stick to published data. Work up loads slowly. PAY ATTENTION to any signs of pressure or problems.
The following I blatantly stole from John Ross:
Attachments
The SAAMI max avg. pressure is 65K psi & as you mentioned most reloading manuals only show data to 55K-57K psi.
http://www.saami.org/specifications_and_information/specifications/Velocity_Pressure_CfR.pdf
I recall seeing (Speer #14) that they do that to avoid sticky extraction & to maintain "reliable extraction". This is supposed to be the same pressure as what factory ammo is loaded to also.
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Road_Clam
Member
SAMMI published techno pressure specs are not a concern to me, they are just engineered numbers. Taking the logical and safe method of working up , then observing for excessively flattened primers , and/or once fired sticking casings in the cylinder from my specific handgun are a concern.
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