Pecos,
I hate disagreeing with you, but....

Peak pressure is a max safe peak pressure.. but has NOTHING to do with max velocity...

For example, one could have a, call it 60k psi max peak pressure... and achieve that peak with blue dot (blaupunkt) or with rel 22... in a 300 winmag/180gr...

the bluedot would have a vel of sub 2000fps, and the rel22 would be at or higher than 3000fps....

btt
How are you mike ??, I would like to hear some response on this one.

Pecos,

What I was asking about was the likely difference of the load on the locking lugs caused by the different duration of the pressure from the 458 Lott and 300 Wby and also the fact the 300 Wby would have a higher average pressure.

The peak load on the lugs will be the same with either calibre but the 300 Wby will have a higher average load on the lugs but the 458 Lott will load the locking lugs for longer.

Mike

Jeffe - I'm talking pressure. I could care less what velocity is. (Or caliber for that matter.)

Mike's question seems like asking if the air pressure is higher on the top or bottom of the tire?

Or, which tire has more pressure...a narrow tire or a wide tire?

Pressure is pressure in my little mind. If someone can show me something convincing, maybe I can put this on my list of things I've learned today. So far I'm not sold.

Mike,

Pecos is the closest to be correct. I don't know what Dan is talking about, PRESSURE IS 1/2 OF EVERYTHING in a pressure vessel!

Let's assume that the cases have about the same thickness, and therefore will produce ~ the same grip on the chamber. Let's further assume both rifles have the same exact head spacing. Therefore, for a given pressure, lets say 62,000 psi, both the 300 Weatherby and the 458 Lott will react rearward against the bolt with ~ the same force (force being pressure times cross-sectional area of the inside of the case head).

The duration of the pressure really does not matter, only the PEAK pressure achieved. This is a cyclic fatigue issue with the rifles and pressures we are discussing. So a basic understanding of cyclic fatigue must be given. Cyclic fatigue is nothing more than the times one exercises a component between the MAXIMUM Force and the MINIMUM Force. Since force and stress are related (in the simplest terms force divided by area = stress), we can see that the higher the force exerted on a given area the fewer the cycles that area can withstand before failure.

Don't believe me, study Stress versus Life curves (S-N curve). They should pop up with a "Google" search.

Now feel free to tell me just how full sh!t I am. I find these comebacks immensely humorous.

ASS_CLOWN