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Posted: 3/10/2004 8:14:49 PM EDT
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What are the advantages and disadvantages? How precise does the work have to be, is there a science to the effects of different lengths? Thanks in advance. |
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The advantages are reduced recoil and better shot patterns. The only disadvantage that I know of is that you can weaken the barrel if the walls of the barrel aren't thick enough. Brownell's sells a lot of different reamers but they all seem to have pretty much the same taper. Vang seems to be the major manufacturer offering forcing-cone lengthening. I have seen some of their shotguns shoot great and some only shoot so-so. They do it for a living and can't seem to guarantee success. I have done several for myself and fellow officers. The reduction in pattern size has been about 25-50%. After I ream the forcing cone, I polish it thoroughly using a flex-hone setup; also from Brownell's. http://www.brownells.com/aspx/ns/home/default.aspx www.vangcomp.com/ |
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I appreciate the reply. Have you experienced any problems using slugs? Is there any loss of velocity? Mainly I'm looking to reduce recoil on a shotgun I'm putting together for my wife, but I may as well do it to all of them if it's an improvement without downfalls. |
| Lengthening the forcing cone, back-boring the barrel, and adding compensating ports reduces recoil and improves patterns with shot charges, bird and buck, but do nothing to enhance accuracy with slugs. Most likely accuracy would be reduced to some extent but not noticeable in a tactical shotgun. MIKE. |
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Awhile back, after a few posts in here and my own experiences with my barrels, I came to the conclusion that porting by itself is what tightens up the patterns. And yes, it does reduce barrel jump. (You guys might remember some info Danonly posted). The other works reduces recoil and helps reduce shot deformation. |
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Its supposed to reduce shot deformation, thereby producing a better pattern, since deformed pellets do not fly as well as round ones. As far as I can tell shooting ANY clays game or wingshooting, I have never seen that shooters using guns with extended cones shoot any better than shooters with 'normal' cones. For myself I can assure you that when I miss a bird its not because of the gun..... |
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It will reduce velocity and energy, but only a little. If it is a gas operated auto loader, be careful. It will reduce chamber pressures and can cause a auto not to cycle reliably. But, better pattern, less fliers and somewhat reduced recoil is a good thing. I use a 11 degree reamer. That thing makes the forcing cone about 5 inches long. Thanks, Lee |
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