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Case head separations caused by very high pressures stretching the case, are VERY different to case head separations in low pressure cartridges fired in double rifles.
Double rifles are a totally different ball game in that respect.
What I'am saying is that separations can occur in DR's due to TOTALLY different reasons to what happens when "Harry the Handloader" overcooks the load for his bolt action super-boomer, or overworks the brass with a badly adjusted resizing die.
To fully understand the difference, you need to have done a LOT of double rifle shooting and a LOT of double rifle reloading, particularly with bottleneck DR cartridges.

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I'm interested in learning these differences as well. I've always been taught that case head separations are due to case web stretching due to excessive headspace - not excessive pressure - and the excessive headspace is either the gun's fault or introduced by the handloader by shortening the brass body or by not fitting the bras prior to firing it. In straight rimmed ctgs. the excessive headspace I speak of is due to rim cuts being too deep for the thickness of the ctg. rims.

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Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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