Jeremy2171
Member
See anything wrong with this??
Another example of why people are confused about garand ammo.
- Thread starter Jeremy2171
- Start date
dogtown tom
Member
It would seem to only confuse those who don't know what caliber/cartridge their rifle uses.
Springfield Armory manufactured M1 Garand rifles in .308 and currently makes the M1A in .308
Springfield Armory manufactured M1 Garand rifles in .308 and currently makes the M1A in .308
OP
OP
Jeremy2171
Member
Nope thats not it....
BreechFace
Member
- Joined
- Mar 2, 2020
- Messages
- 3,556
Other than talking about M1 Garands in 308 Win which would be a retrofit.
I'm assuming you are speaking to where they arrived at the 50,000psi max chamber pressure? This would be probably from the Army's maximum allowable pressure of M2 Ball is 50k c.u.p., so they are comparing two different forms of measurements.
Max pressure for 7.62x51mm is ~60k psi
Max pressure for 308 Win is ~62k psi
Converting CUP to PSI formula (which is not necessarily true science, but the below equation is commonly used to convert)
PSI = -17,902 + 1.516 x CUP
So 50,000 cup (m2 ball max allowable) yields
50,000cup x 1.516 = 75,800 - 17,902 = 57,898psi
I'm assuming you are speaking to where they arrived at the 50,000psi max chamber pressure? This would be probably from the Army's maximum allowable pressure of M2 Ball is 50k c.u.p., so they are comparing two different forms of measurements.
Max pressure for 7.62x51mm is ~60k psi
Max pressure for 308 Win is ~62k psi
Converting CUP to PSI formula (which is not necessarily true science, but the below equation is commonly used to convert)
PSI = -17,902 + 1.516 x CUP
So 50,000 cup (m2 ball max allowable) yields
50,000cup x 1.516 = 75,800 - 17,902 = 57,898psi
Last edited:
PWC
Member
GUS FISHER!! - there's a name from the past! Anything Gus says about the M1, M14 and 1911, in all their variants, you can take to the bank.
He used to live on the CSP (Culiver's Shooting Pages), now Jouster 2 before the trolls tried to stage an unsuccessful takeover. If you go to Lanes Tips, you will find all kinds of info on the above arms and more.
Someone said after he lift Jouster 2 he went to one of the black powder forums. I miss his patient posts and the depth of knowledge from this old Marine armorer.
If you can get to Lane's Tips, copy and or print what you can, cause it won't come this way again. If you can't, let me know and I can share what I have.
He used to live on the CSP (Culiver's Shooting Pages), now Jouster 2 before the trolls tried to stage an unsuccessful takeover. If you go to Lanes Tips, you will find all kinds of info on the above arms and more.
Someone said after he lift Jouster 2 he went to one of the black powder forums. I miss his patient posts and the depth of knowledge from this old Marine armorer.
If you can get to Lane's Tips, copy and or print what you can, cause it won't come this way again. If you can't, let me know and I can share what I have.
OP
OP
Jeremy2171
Member
PWC
Member
I'll take Gus's experience as the Marine Shooting Team armorer and years of experience at mil rifle rebuild / modifying / building over your opinion, as you believe is supported elsewhere.
OP
OP
Jeremy2171
Member
OP
OP
Jeremy2171
Member
There is no direct conversion.
50,000 cup
60,180 psi
Are both the SAAMI max chamber pressure for 30-06.
Just measured differently with different test equipment.
So people who "trust" Someone because they've been building guns a long time instead of following the facts which happen to disagree with their feelings may not be able to be reasoned with.
Facts be damned...
