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Re: marks on bullets
Posted by steven gabrielli on Thursday, 28 July 2011, at 7:55 a.m., in response to Re: marks on bullets, posted by steven gabrielli on Thursday, 28 July 2011, at 7:46 a.m.
Just for reference- Obturate means to block or obstruct. With reference to firearms and airguns, obturation refers to the process of a bullet or pellet, made of soft material and often with a concave base, flaring under the pressure of firing to seal the bore and engage the barrel's rifling. The mechanism by which an undersized soft metal projectile enlarges to fill the barrel is, for hollow-base bullets, due to expansion from gas pressure within the base cavity and, for solid-base bullets, upsetting - the combined shortening and thickening that occurs when a malleable metal object is struck forcibly at one end.
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