CZ 550 Magnum action max. pressure?

[Carsten]

One of my CZ 550 Magnum rifles has “Max. 3800 bar” roll stamped to the side of the action.

I am not quite sure how to read that number.
There is no pressure inside the action, only bolt thrust which of course depends on the diameter of the case, all else being equal.
I have seen the 550 chambered in all sorts of modern calibers far exceeding 3800 bars.
460 Weatherby and 338 Lapua just to name a couple with high pressures.

I am not sure in which caliber this action is born but my guess would be 505 Gibbs.
Then the stated max. pressure would make some sense.

Anybody else with this stamp and what caliber?

 

[Flewis]

Wouldn’t that be about 52k psi or so? My 458 Lott runs at 62k and that’s a 550.

 

[Carsten]

That”s 55k psi and yes we do run much higher pressures in that action.
That is why I am thinking it must apply to the largest calibers where bolt thrust might be an issue.

 

[Flewis]

Yeah the 505 and 500j run much lower. You are right about the bolt thrust. Also the bolt is maxed out for the 505.

 

[krish]

One of my CZ 550 Magnum rifles has “Max. 3800 bar” roll stamped to the side of the action.

I am not quite sure how to read that number.
There is no pressure inside the action, only bolt thrust which of course depends on the diameter of the case, all else being equal.
I have seen the 550 chambered in all sorts of modern calibers far exceeding 3800 bars.
460 Weatherby and 338 Lapua just to name a couple with high pressures.

I am not sure in which caliber this action is born but my guess would be 505 Gibbs.
Then the stated max. pressure would make some sense.

Anybody else with this stamp and what caliber?

My 416 rigby cz action stamped

4300 bar. What action do you have.
Krish

 

[krish]

Wouldn’t that be about 52k psi or so? My 458 Lott runs at 62k and that’s a 550.

That is why.
Krish