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Pressures:pacman:

67k is not something that has been run in a case with a .640 case head for 30-40 years Spanner.
The 408 and 375 chey tac were designed to run at normal magnum pressures of around 63k.

I know...

As you say the brass has been designed to take 88k. It may not show pressure signs till this pressure, you don't know as you haven't seen any. So you could be subjecting your action to this much...

Spanner are you suggesting that the lug shear point on the Barnard it at 165k pressure in a Chey tac case? Using your extensive reloading knowledge, what do you think is a reasonable pressure to run...

Spanner if you need to full length size every time you fire the case it just proves you load to hot. What Kirby clearly says is that the hard brass like Lapua, Jamison ect will not show pressure...

In Kirby's example they didn't reach the elastic limit of the brass until the action was damaged.

Yes but how far bellow you don't know. You also don't know at what point you will start damaging the action. This is what I keep trying to say, but all you can say is its not failing YET!

But Spanners if this brass acts the same as all brass in all calibers has done for the last 100 years then why is it safer to run to a much higher pressure?

However it beats the science you are using spanner. Ignoring the strain gauge and trying to tell others they are just under loading. That may be the case, but you have no idea of the brass or action...

I am not saying anyone is doing damage to their actions here, I'm just asking how you know they can handle these higher pressures safely.

I think it's one of those situations where you should do...

No the bolt lift problems came from the lug setback, so the brass signs came as a result of the action damage.

I don't know of anybody who has asked. I'll call Barnard tomorrow and ask them.

Not in Kirby's case in the link.

I think it would be the duty of an action manufacturer to give a safe working pressure of their action.

The problem you have spanners is you have no idea of the failure point of the action. If you don't trust the strain gauge why don't you buy a pressure transducer from oehler and use that to...

Again Spanner you are assuming that you know how the cases are different. You have never had a Lunatic case to measure.

87654 or 88k if you like came straight from you in a earlier post.
You make a lot of assumptions about how strong an action is and how much pressure they can take. If you read the link posted a...

Because we are using actions and brass similar to say 338 lapua which has a safe working pressure of around 65-67k. What makes you think that it's sweet to run cheytac brass up to 88k when nothing...

It was not taken to the "limit" as it would risk my action, brass and the person shooting it.

There is not a lot between no signs and failure on some of the hard brass. Personally I would like a large safety margin back from the point of failure to protect my eyes, face, life if anything is...

The 375 cheytac is no new round. And in NZ we are by no means the first to improve it. So there is already data with regards to velocitys for the cheytac case.

Spanners you really are talking shit. My 375 Lunatic is at 67,000psi and makes a 400gr projectile go 3035fps. Kiwi Greg's 375 DCM is at ???? Pressure and makes a 425gr projectile go 3080fps.

Kiwi...

Yes I'd say 100k pressure is very safe in a big fuck off Barnard PChey action.