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First off, is the degree # the included angle or degrees from parallel to the bore?
What’s the S&W factory angle?
What’s the S&W factory angle?
Forcing cone angle questions
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Protocall_Design
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It is the included angle. The angle "per side" is half of the included angle, or angle from the bore centerline.
I am guessing the factory uses 11 degrees, but can't confirm.
I am guessing the factory uses 11 degrees, but can't confirm.
It is my understanding that in the remote past, S&W revolver forcing cone angles were 18 degrees; modern production barrels have a 11 degree included angle, 5.5 deg off the bore axis.
The 18 deg chamfer has a slight accuracy advantage with jacketed bullets.
The 18° chamfer has been used quite often by firearms manufacturers, and in most instances, will provide a slight accuracy advantage when shooting jacketed bullets. The 11° Cutter was designed by Ron Power after extensive research and experimentation during which Ron found that the 11° chamfer provided optimum accuracy when using hollow-base lead wad-cutter bullets, the type most often used in PPC guns.
Increasing the forcing cone angle will generally improve accuracy at expense of 50-75 fps muzzle velocity loss.
The attached photos demonstrate the details a 11 degree forcing cone plug gage. The gage is caliber specific and used to judge the gunsmith work when chamfering the forcing cone with cutters. The Brownells plug gage is listed as 11-18 degrees.
Perhaps the more experienced might chime in.
The 18 deg chamfer has a slight accuracy advantage with jacketed bullets.
The 18° chamfer has been used quite often by firearms manufacturers, and in most instances, will provide a slight accuracy advantage when shooting jacketed bullets. The 11° Cutter was designed by Ron Power after extensive research and experimentation during which Ron found that the 11° chamfer provided optimum accuracy when using hollow-base lead wad-cutter bullets, the type most often used in PPC guns.
Increasing the forcing cone angle will generally improve accuracy at expense of 50-75 fps muzzle velocity loss.
The attached photos demonstrate the details a 11 degree forcing cone plug gage. The gage is caliber specific and used to judge the gunsmith work when chamfering the forcing cone with cutters. The Brownells plug gage is listed as 11-18 degrees.
Perhaps the more experienced might chime in.
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I agree whole heartedly! I have used a few different angles over the years and quite honestly I've found no discernible difference. As WR Moore posted above, the finish on the cut matters more than the actual angle. That has been my personal experience.
