When I mentioned 10% space in the shell I was referring to a pistol shell as the question was about â??Why is automatic pistol cartridge case so long?â?
I agree that too much space in the case is very dangerous for both rifle and pistol.
That is why I recommended a loading manual because there is a vast loading date and very different opinion about this subject
Regarding rifle shells yes it is better and safe to fill the case, but compressed charge is dangerous on both pistol and rifle.
Alf.
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I prefer a Luger
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