PUBLIC Forums => Public Forums => Call For Assistance Feedback => Topic started by: Brian Rothfuss on January 14, 2010, 03:19:21 PM

Title: GRC question
Post by: Brian Rothfuss on January 14, 2010, 03:19:21 PM

Afternoon,

I recently received a 45 caliber bullet jacket with six lands and grooves inclined to the left with approximate land impressions of 0.135” and groove impressions of 0.091”.  The FBI 2008 GRC list shows nothing within that range, and I was hoping someone might have seen this before and could help.

I appreciate any assistance in this matter,

Brian Rothfuss
Forensic Scientist
Virginia Department of Forensic Science
700 N 5th St.
Richmond VA. 23219
(804) 786-4707 ext 22310

Title: Re: GRC question
Post by: Bill Moore on January 15, 2010, 07:49:26 AM

Brian,

In carpentry, the rule is to measure twice and cut once.  I do not doubt you did the equivalent but your values come up with something between a .41 caliber and a .44 caliber bullet.

If you use 0.091" as the limp value and 0.135" as the gimp value then you get a .44 Magnum Sauer & Sohn model Western Marshall revolver in the GRC list.

If that doesn't answer your question then I suggest that you recalibrate your measuring equipment.

Good luck,
Bill