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11 degree forcing cone angle

This is a discussion on 11 degree forcing cone angle within the Gunsmithing forums, part of the Firearm Forum category; If I buy the 11 degree tool for my Rugers will it help the S&W 686 to change the 8 degree to an 11 degree ...


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Old August 17th, 2009, 04:13 PM   #1
 
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11 degree forcing cone angle

If I buy the 11 degree tool for my Rugers will it help the S&W 686 to change the 8 degree to an 11 degree angle?
What say you Iowegan on the subject?



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Old August 17th, 2009, 06:07 PM   #2
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claybird, The 11 degree reamer will work with any revolver from 357 to 45 cal. The primary reason to use an 11 deg reamer is to optimize a revolver for lead bullets. 8 Degree cones are fine for jacketed bullets.
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Old September 3rd, 2009, 06:37 AM   #3
 
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Question

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Originally Posted by Iowegan View Post
claybird, The 11 degree reamer will work with any revolver from 357 to 45 cal. The primary reason to use an 11 deg reamer is to optimize a revolver for lead bullets. 8 Degree cones are fine for jacketed bullets.
Iowegan, have you found that it actually improves the performance in the revolver enough to be worth the $$ outlay? I cast my own and shoot cast lead bullets exclusively.

Thanks
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Old September 3rd, 2009, 09:43 AM   #4
 
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Remember when ya mastered the bicycle ??? & ya built a ramp with a little short board & it slide off the bait then ya got a longer board & all was good.
that`s the difference between the 8degree & the 11degree forcing cone .

I have 4 i need to ream now.
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Old September 3rd, 2009, 10:06 AM   #5
 
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I prefer 5 degrees. With an 8 degree cone, you probably won't have enough barrel to cut out the 8 degree cone without leaving a step in the cone. A 5 degree cleans it up completely without enlarging the mouth of the cone.
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Old September 3rd, 2009, 05:25 PM   #6
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Ruger uses a 5 degree F/C and S&W uses an 8 degree F/C. Both work well with jacketed bullets with round shaped noses. 8 degree cones are much better with lead bullets and 11 degree cones are even better with wad cutters or semi-wad cutters. Yes, the mouth diameter does increase when you chamfer with a wider angle but it's really not a big deal. A larger diameter mouth will lose a token amount of pressure through the B/C gap, which in turn lowers muzzle velocity a tad. Worst case ... going from a 5 degree cone to an 11 degree cone, you may lose as much as 50 fps with a full magnum load with jacketed bullets. I consider this a small price to pay for enhanced accuracy, less fouling, and less "splashback" on the cylinder face.

Besides optimizing for lead bullets, chamfering a forcing cone can eliminate nasty machine marks or other imperfections that are so common in Rugers and S&Ws. Corrupt forcing cones cause fouling and accuracy problems. Unfortunately, Brownell's no longer sells 8 degree reamers ... only 5 and 11 degree, so for a Ruger, you can clean up the factory cone with a 5 degree reamer or chamfer to 11 degrees for lead bullets. With a S&W, you don't have much choice ... it's either an 11 degree or nothing. You never want to ream with a lesser angle because it will result in a "compound cut" that can foul badly and cause accuracy problems.

TomC, I've chamfered a good many 38/357 forcing cones from 5 to 11 degrees and never came close to running out of barrel diameter. You really don't go deeper than the factory cone .... just wider so a "compound cut" (step) is never an issue but certainly would be if you reamed with an angle less than the existing cone.
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Old September 3rd, 2009, 08:45 PM   #7
 
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What's a representative cost to have something like this done to my Ruger Super Redhawk. I shoot my own cast lead bullets exclusively through this gun. Thanks in advance.
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Old September 3rd, 2009, 09:38 PM   #8
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LET-CA, Brownell's sells the basic 11 degree chamfer kit for about $80. It includes the reamer itself, a shaft, handle, bore centering guide, and an Allen wrench. It's very easy to do yourself and all you need to supply is oil. Instructions are available in the Library. See: http://www.rugerforum.net/showthread.php?t=8731

Gunsmiths will do this for you but I wouldn't want to quote a price because they are all different. When I had my shop, there was a $25 minimum charge for simple things like this, mostly because of the BATFE hassle. If I did other work on the gun, I would usually charge $10 extra for chamfering the forcing cone.
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Old September 7th, 2009, 07:46 AM   #9
 
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On this note, I also notice your recommendation for the 8 degree forcing cone reamer to also chamfer the cylinder chambers. Can this also be done with the basic chamfer kit from Brownells as well even though you can only get them for 11 degree and 5 degree? Which one would be better?
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Old September 7th, 2009, 01:13 PM   #10
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earlthegoat2, Actually the forcing cone chamfer kit comes with an 82 deg reamer for breaking the edge of the forcing cone. This reamer cuts a great 8 degree angle at the chamber mouth, which greatly enhances loading with speed loaders or even single loading.
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