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OK I have a question about rifling... no so much shooting related.

 
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Old 03-12-2010, 07:49 PM
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Re: OK I have a question about rifling... no so much shooting related.

Quote:
Originally Posted by Topshot View Post
The smart crook will after the crime, put a bit of lapping compound and sand grit on a cleaning patch and run it through his barrel a few times.

Shazzam, the barrel has a different finger print and the perfect crime has been committed.

That is until they find the patch with grit and paste! Not thinking of doing this are you?
Forensic analyzers can also take spent cases and match the tooling marks impinted on the primer and case base. Even with a new barrel or modified barrel they can still match a case to an action. Not so much an issue for revolvers and bolt guns but can be problomatic with semi-autos when cases are flying every which way.
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Old 03-12-2010, 08:25 PM
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Re: OK I have a question about rifling... no so much shooting related.

Did you guys all belong to the Mafia?
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Old 03-13-2010, 01:42 AM
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Re: OK I have a question about rifling... no so much shooting related.

No, just smarter that the average bear Bo Bo.
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Old 03-13-2010, 04:34 PM
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Re: OK I have a question about rifling... no so much shooting related.

lol topshot... no im not thinking about it... I just like watching csi, and ncis and shows like that. Not the killer type myself. Definately not one where it would be anything other than self defense!
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Old 03-14-2010, 06:31 AM
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Re: OK I have a question about rifling... no so much shooting related.

Quote:
Originally Posted by joshua99ta View Post
this just kind of bumfuzzles me how supposedly they can prove that a bullet came from a certain barrel when there are thousands a day produced.

I mean I know the chances of somebody else could have a rifle with the same tooling and it be in the same place arent likely but I doubt mass produced barrels have different toolings for every barrel.
They certainly look different, even to the eye in a borescope. Also, the usage histories of the rifles will be different probably beginning with the first shot. Different break in, different cleaning, different bullets, plus the initial differences just in chambering tolerances (which are pretty wide in factory guns) and there is essentially zero chance the scratches on the bullets or cases will be identical.

Trust me on this, based on years of looking for root cause failures in silicon chips it is really hard to make things as gross as a barrel identical at a microscopic level on purpose, never mind by accident.

Fitch
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