7.62x54r Ammo

[biscuitninja]

I am trying to figure out barrel pressures for my 91/30 Mosin Nagant.

The ammo I'm currently using is the Bulgarian heavy ball ammo. Any ideas?

Some information.

182 grain bullet

power/propellant - Unknown - 63.9 cc volume and 47.2 cc of propellant.

Ballistic Coefficient - .368

Sectional Density .269

Dia. .311

Barrel Slugged at .309/.311

Velocity average 2621 fps.

any ideas let me know.
-bix

[alpha_romeo_XV]

A look at www.hodgdon.com

[Ironchef]

I think I read somewhere that the 91/30 pressure is like 75k PSI. It was in a forum where they were talking about leaks and how explosive it is in their and why it heats up so much and melts finish out of stocks.

[virulosity]

54r is definitely a higher pressure round. For your purposes though, why risk it? Just start low and build your way up.

[ar15barrels]

I am trying to figure out barrel pressures for my 91/30 Mosin Nagant.

While this does not answer your exact question, I can tell you that the CIP spec for 7.62x54 ammo is 3900bar, or 56,565 PSI.

[ar15barrels]

I think I read somewhere that the 91/30 pressure is like 75k PSI.

Don't believe everything you read on the internet.

[biscuitninja]

While this does not answer your exact question, I can tell you that the CIP spec for 7.62x54 ammo is 3900bar, or 56,565 PSI.

That's kinda the answers I was coming up with.
There is kinda a round about conversion, to CUP, but it involves the Material/mechanical properties (modulus of elasticity and a few other items) guessing at piston size, and deformation of copper (as well as hardness)
Anyways I came up with about 54ksi to just over 61ksi. Not a HUGE range but about 57ksi +/-3ksi (about a 5% error).

Not exactly bad for a semi educated SWAG.
anyways good luck
-bix