allaroundhunter
Member
I was looking through Hodgdon's reloading data center today at different .308 rounds and found something that made me curious.
I was looking at .308 155 gr loads and found that some of the max loads had pressures in excess of 60,000 psi, while other max loads were under 50,000 psi.
An example:
Bullet: 155 GR. SIE HPBT
Powder: Hodgdon CFE 223
Bullet Diameter: .308"
Powder charge: 51.0 grains
MV: 2966
Pressure: 60,500 PSI
Bullet: 155 GR. SIE HPBT
Poweder: IMR 4007 SSC
Bullet Diameter: .308"
Powder Charge: 49.5C
MV: 2751
Pressure: 49,900 PSI
Can anyone explain the differences in MV and pressure to me? And also what the 'C' stands for in the powder charge of the second round?
Is it due to the CFE 223 being a faster burning powder? What is a "safe" max pressure for a .308?
Sorry for all of the questions, just trying to get some stuff figured out.
I was looking at .308 155 gr loads and found that some of the max loads had pressures in excess of 60,000 psi, while other max loads were under 50,000 psi.
An example:
Bullet: 155 GR. SIE HPBT
Powder: Hodgdon CFE 223
Bullet Diameter: .308"
Powder charge: 51.0 grains
MV: 2966
Pressure: 60,500 PSI
Bullet: 155 GR. SIE HPBT
Poweder: IMR 4007 SSC
Bullet Diameter: .308"
Powder Charge: 49.5C
MV: 2751
Pressure: 49,900 PSI
Can anyone explain the differences in MV and pressure to me? And also what the 'C' stands for in the powder charge of the second round?
Is it due to the CFE 223 being a faster burning powder? What is a "safe" max pressure for a .308?
Sorry for all of the questions, just trying to get some stuff figured out.