90,000 psi loads ?

[J E Custom]

Originally Posted by GMBshootingclubM60

What's an RSI? Roy's stretch indicator? (smile)

Now thats funny !!!!!!!!!! I don't care who you are.

J E CUSTOM

[royinidaho]

No I didn't magna flux it. Just kept on shootin'.

RSI Inc. Recreational Software Inc. Ballistics Software, Chronographs & Pressure Instruments For Shooters

Actually Roy's Stretch Indicator is a piece of type writer correction tape that has been typed on. Its wrapped around the chamber then distortion of the lettering is measured. Hmmmmm, I wonder if that would actually work?

[GMBshootingclubM60]

I went to RSI and read the story of the peak pressure happening twice. The second peak was WAY high.

It would seem to me that if you put a second stretch gauge a few inches down the barrel from the chamber gauge, it would measure the second peak only.

That is, the chamber gauge would have the double hump and the gauge farther down the barrel would only have a single hump, the secondary peak, if it existed.

[royinidaho]

I've seen the double hump trace on my 338 RUM but it was way smaller than the first.

(No observable stretching on "Is". Was observable on "E"s)

Was told it was common several cartridges.

I've heard of reflecting shock wave theory. Suspect this is what blows up 22-243s with low loads of 4831. Either way I solved that potential problem by never shooting that cartridge.

[GMBshootingclubM60]

Is this why some of the 50BMG loaded way back when had a handful of long, noodle-looking strands of powder, instead of the granules they use today? Perhaps this would avoid the 'explosion instead of burning' problem?