breakthrough
Moderator
are you NOT supposed to shoot these ammo in certain guns? why?
what is + p and + p + ammo anyway?
what is + p and + p + ammo anyway?
Not all hype, some makers, like Speer, do have a rating for it, in this case, 40,000 psi. At least that was the figure they gave me when I was asking.+P+ is TOTAL marketing hype with no underlying SAAMI spec.
Can I use +P and +P+ ammunition?
Glock suggests using ammunition that is manufactured and meets SAAMI or industry specifications. If you are not sure the ammunition brand or type you choose is safe for use, call the ammunition manufacturer and ask if the product meets SAAMI guidelines before using it in you firearm. Some +P ammunition meets these guidelines, +P+ normally does not. This ammunition may generate a higher pressure over the standard loadings, and may shorten the component life of your firearm.
may shorten the component life of your firearm.
Just a few thoughts on this. For Background I am a mechanical engineer with a heavy background in failure and fatigue.
I wonder if I could request a high quality photo of the fracture zone of the cylinder? I am specifically interested in the grain structure of the bolt notches.
I put fort the following.
1) Firearms in general (the type we plebeians can get our mits one) are not designed for infinite fatigue life.
2) The Factors of safety used in firearms design are in line with low end of fatigue requirements (usually less than 10,000 cycles).
3) One of the funny things about fatigue is that each time you push the material past its original design point, you lower its expected life.
4) I am looking at this as an older gun with an unknown number of rounds through it. but based on its age a substantial round count seems likely.
5) When these firearms are designed it is generally preferable for something else to go before the cylinder lets go and takes the top strap. Generally this takes the form of the gun wearing loose or the barrel wearing out. But they are designed to handle X rounds at standard pressures.
6) I see alot of folks calculate the strengths of Rugers, but these calculations are only ever performing an evaluation on a straight static pressure basis. This is wrong when trying to determine if a load is safe.
I attached a couple of marked up figures for your perusal
Other +P loads and ALL +P+ loads are outside of industry standards and you really don't know what you are getting.
I think the big companies know exactly what they are producing, and have standards.We just don't know what pressures are being generated.