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

 
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Old 03-12-2010, 05:13 PM
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OK I have a question about rifling... no so much shooting related.

I doubt this IS the proper place for this BUT it does say barrels! lol

I keep seeing all of this here info on TV about ballistics testing on these murder shows and stuff. They take a certain gun and match the rifling on a bullet recovered from a body and then take the supposed gun and fire a round and then match the rifling.

NOW my question is that if a barrel is made with any sort of quality control shouldn't ALL of the riflings MATCH IDENTICALLY??

I mean if you take 2 remington 700 barrels produced on the same day one after another with the same tooling it looks like to me that a bullet fired from each should match exactly?!?
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Old 03-12-2010, 05:35 PM
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Re: OK I have a question about rifling... no so much shooting related.

Good question. Who would know the answer??

So, in my best guess: OK, the 2 rifles you mentioned would be very similar but what's the odds of the two owners being in the same place ( the crime scene ) at the exact same time? I think the prosecutor still needs to place the defendant at the crime scene to make a conviction stick.

JM .02
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Old 03-12-2010, 06:00 PM
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Re: OK I have a question about rifling... no so much shooting related.

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.
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Old 03-12-2010, 06:25 PM
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Re: OK I have a question about rifling... no so much shooting related.

That is like saying there are 7 billion people in the world therefore 100,000 people must have the same DNA.

The fact is that no 2 peices of steel are the same. They will react differently to the tooling being used. Tooling wears with every barrel it passes through and will be micrscopically different each time it makes a barrel. Some barrels are lapped. There is no way 2 barrels could be lapped the exact same way. Shooting and cleaning alters the barrel as well. There is no way that microscopically, 2 barrels are equal. This is why they call it 'fine striations' It takes a micro scope to see these differences. There are simply too many variables to make barrels have the exact same fine striations.
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Old 03-12-2010, 06:29 PM
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Re: OK I have a question about rifling... no so much shooting related.

Quote:
Originally Posted by Michael Eichele View Post
That is like saying there are 7 billion people in the world therefore 100,000 people must have the same DNA.

The fact is that no 2 peices of steel are the same. They will react differently to the tooling being used. Tooling wears with every barrel it passes through and will be micrscopically different each time it makes a barrel. Some barrels are lapped. There is no way 2 barrels could be lapped the exact same way. Shooting and cleaning alters the barrel as well. There is no way that microscopically, 2 barrels are equal. This is why they call it 'fine striations' It takes a micro scope to see these differences. There are simply too many variables to make barrels have the exact same fine striations.
Agree with Michael.....Rich
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Old 03-12-2010, 07:14 PM
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Re: OK I have a question about rifling... no so much shooting related.

Think of them as the "fingerprints " of the rifle......no two are the same. if a bullet is recovered in decent shape it is about 99% that it can be matched to the gun, providing the gun is available and has not been altered. I watched a whodunit the other night where the perp killed a lady with a .45 auto, then ran a drill bit down the barrel and made it a smoothbore......but.....the investigators dug old bullets out of a dirtbank where he had been shooting and matched them to the bullets recovered from the body....busted!...AJ
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Old 03-12-2010, 07:36 PM
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Re: OK I have a question about rifling... no so much shooting related.

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?
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