The L.C. Smith Collectors Association
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Forcing cone question

Posted by William Norton on October 12, 2017, 1:39 pm
173.12.227.65

 I have read a lot about lengthening forcing cones, especially in vintage shotguns, and have entertained the idea of having my 1948 12 gauge Field cones lengthened. I read a statement from the Legend Lives book that states, "The forcing cones for all LC Smith shotguns and for all gauges were tapered 1 7/8" in 12 1/2" from the chamber to the bore". What exactly does this mean? Sounds like the forcing cones are longer and have more taper than many of the newest shotguns produced today.

Re: Forcing cone question

Posted by David Williamson on October 12, 2017, 3:39 pm, in reply to "Forcing cone question"
174.60.241.111

 William it means that in 12 1/2" the taper would be 1 7/8". A 12 gauge chamber would be 2 3/4" long and at the end of this taper, which from the factory, measures .797. From this point to start of bore (.728) is where the forcing cone taper is. That taper would be .069 in that short of an area.

Re: Forcing cone question

Posted by William on October 12, 2017, 5:12 pm, in reply to "Re: Forcing cone question"
173.12.227.65

 So the 1 7/8" in 12 1/2" is just the ratio at which it tapers? I think I get it. So working backwards if the taper is .069, the length of the cone is right at 1/2"? I think I'm over thinking it!

Re: Forcing cone question

Posted by Gary Rennles on October 12, 2017, 6:59 pm, in reply to "Re: Forcing cone question"
108.24.117.252

 This may help. http://library.centerofthewest.org/cdm/singleitem/collection/WRAC/id/8234/rec/10

Re: Forcing cone question

Posted by David Williamson on October 12, 2017, 7:51 pm, in reply to "Re: Forcing cone question"
174.60.241.111

 William, the 1/2" is probably correct. Gary, I actually got the information from Brophy's book "Plans and Specifications" and it shows that exact picture. There is also a later one from 1936 I believe.

Re: Forcing cone question

Posted by Marcus Merritt on October 15, 2017, 4:29 pm, in reply to "Forcing cone question"
67.166.248.185

 Mr. Norton...I was curious to see what my chamber looked like so used a Cerrosafe product to get a casting of the chamber/forcing cone of my 1905 00 grade 12 gauge. See this email for a photo of the casting that came out of the chamber. Approximate dimensions are written on the casting. It was interesting to see the chamber in this 3D form. Here's the email: http://members.boardhost.com/lcsmith/msg/1403378797.html

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