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Old 11-21-2011, 06:01 PM
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Default Forcing cone

Would someone tell me what a forcing cone is and where it is located on S&W revolvers, such as K22 and K38.
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Old 11-21-2011, 06:12 PM
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If you open the cylinder of any gun and look forward at the back end of the barrel, that is where the forcing cone is. It's a smooth countersunk taper or cone machined into the barrel end to "force", or to guide, or to align the bullet into the lands and grooves of the rifling and send the bullet on it's way down the barrel. Shine a light at the forcing cone and you can see the smooth area before the rifling, that's the forcing cone. Hope that helps.
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Old 11-21-2011, 08:11 PM
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Quote:
Originally Posted by diamonback68 View Post
If you open the cylinder of any gun and look forward at the back end of the barrel, that is where the forcing cone is. It's a smooth countersunk taper or cone machined into the barrel end to "force", or to guide, or to align the bullet into the lands and grooves of the rifling and send the bullet on it's way down the barrel. Shine a light at the forcing cone and you can see the smooth area before the rifling, that's the forcing cone. Hope that helps.
perfect explanation....good job.
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Old 11-22-2011, 02:14 AM
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Default Forcing cone

Guys,

Thank you for educating me. The Forum has been a great help to me.

John
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Old 11-22-2011, 12:58 PM
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Interesting video on a DIY forcing cone clean up job: Revolver Forcing Cone Tools - YouTube
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Old 11-22-2011, 08:44 PM
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Nice video, but he forgot the most critical part.

The forcing cone is a very misunderstood part of the revolver barrel and even many professional gunsmiths don't really understand them.

THE critical dimension of a forcing cone is not the depth or angle of the cone, it's the diameter of the MOUTH of the forcing cone.
That outer mouth dimension is critical.
Too small and the revolver will be inaccurate and may spit bullet metal.
Too big and accuracy suffers.

An important part of cutting or re-cutting a forcing cone is to use the special drop-in plug gauge.
This precision gauge gauges the the outer diameter of the cone and makes sure it's not too big or too small.
The difference between too big and too small is tiny and you can't eyeball it.
Just cutting a cone blind without using the gauge is what often causes a revolver to suddenly loose accuracy.

This is what many people don't know, so they just cut cones blind.

BARREL CHAMFERING PLUG GAUGES - Brownells
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Old 11-22-2011, 09:21 PM
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Forcing cone? Right behind the ice cream cone..........sorry. Couldn't resist.
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Old 11-23-2011, 06:58 AM
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Picture--this is a S&W M29 in 44 Magnum --not that it
matters --they should all look the same. Pete



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44 magnum, brownells, k22, k38, m29, model 29

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