it's a bit difficult for me to put in English what i would like to say but ... there are at least 3 reasons why i wouldn't do that 
1) chances are that the cap fails - no harm
2) cap works but propeller (cordite,powder,etc) is humid and doesn't burn well - you may end up with a bullet stuck in the barrel
3) cap & propeller are fine, but brass case "walls" are weakened by the age and corrosion and cannot contain the blast - you may eventually end up with a damaged weapon and injury yourself.
just an example : 45 rounds ground dug, even when they look perfect, in my experience have most of the times the case walls compromised and just the unloading with the kinetic hammer, will break the case in half.
1) chances are that the cap fails - no harm
2) cap works but propeller (cordite,powder,etc) is humid and doesn't burn well - you may end up with a bullet stuck in the barrel
3) cap & propeller are fine, but brass case "walls" are weakened by the age and corrosion and cannot contain the blast - you may eventually end up with a damaged weapon and injury yourself.
just an example : 45 rounds ground dug, even when they look perfect, in my experience have most of the times the case walls compromised and just the unloading with the kinetic hammer, will break the case in half.
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