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Greetings,
As the pressure rises beyond the yield point of the copper cylinder the cylinder starts to deform and continues to do so until the pressure drops so the cylinder is deformed by both the...

Greetings again,
There is no accurate way of converting CUP to PSI. At higher pressures the PSI figure is higher. At lower pressures the two are about the same and at very low pressures CUP can be...

Greetings sneeze,
Thanks for your reply. I don't dispute any of the points you make on the newer powders, barrel length etc. My point was that most of the gains in velocity could be made with the...

Greetings All,
I did a bit of work a few years back developing a decent load for the 129 grain projectile in my standard 6.5x55 so repeated it for the 140 grain. The Hodgdon data includes pressure...

And the K Hornet before that and on ad infinitum.

Greetings kiwi303 and all,
First my apologies for having, along with others, hijacked your thread. Parker Ackley came out with his series of improved cases in the 1940's and 50's. The idea was to...

Greetings All,
After writing my earlier post I started thinking about what hot shot .22 cartridge is about these days? A friend was waving a 6.5 Grendel in front of me yesterday and I wondered if...

Just shows that there is very little that is really new. Case shapes change but performance not so much.
GPM.

Greetings All,
The extravagant claims for vastly increased velocity in AI cases are only made with vastly increased pressure. Time after time actual pressure tests have shown little, if any,...