I looked up "obturate". It is the process of the bullet expanding to engage the rifleing. Okay, why is the unfired bullet larger than the bore, and more so with a lead bullet? The bore being smaller must be causing a swedging of the bullet and giving a better seal. Hornady lead bullets are the same as my cast bullets, e.g. .358", but the clad XTP is .357". Help me with the "lot of misconceptions", please. I have several reloading manuals, none of which adequately address my questions.
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686 & 629
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