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Guns designed for black powder often have greater headspace and barrel/cylinder gaps with a little endshake thrown in for good measure.
Now when a case fails, it is almost always a result of shooter error: firing the rifle with the bore obstructed, loading the wrong caliber cartridge, or poor handloads with excessive headspace or the wrong powder.
However, this is a tricky situation, because the processes of diffusion and desorption are continuing, and the EtO concentration in the headspace may again rise above the LEL level.
A quick look at any Model 1911-type.45 pistol will show that the extractor does not, and is not intended to, hold the case back against the breech face and provide proper headspace .
Savage's ingenious method of achieving consistent close-tolerance headspace is often cited as the reason for the 110's reputation for accuracy.
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