forging cone polish
Is it ok to polish the forging cone of a revolver? Also what is the angle of the forging cone of a Colt 44 special? Mine has machining marks that causes leading. Thanks
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hello you want to polish NOT remove more metal than needed so you dont need to worry about angle as you should not take enough metal to change the angle. only other suggestion is pay for a gunsmith that has done that job with a reamer be very careful if you have not polished before once you remove metal you cant put it back and the forcing cone is a very high pressure area.
EDIT it looks like you have opened a number of topics about handguns. so lets get some terms in place. First most people talk of revolvers and then on semi auto handguns are for the most part refered to as pistols on a revolver the barrel has no part of the chamber as the cylinder is made up of holes any number from 4-10 on most Revolvers the cylinder may have a hole the same diameter from front to rear while others may have a step toward the front to keep a pistol chambered for 38 Special will not allow a 357 MAGNUM to chamber . Then we also have a Barrel the barrel is finished after boring with a method of rifling that gives the bullet IT'S spin so the bullet when fired has to make the transition from cylinder to Barrel the barrel is finished machining long ways front to back but the transition area the forcing cone Forces the bullet into the barrel its shape is a cone but in machining it may put fine scratches in the front part of the cone shape . Thus it will scratch the bullet as it enters the Bore and this causes the lead to smear which leads to more and more smearing or leading When I spoke of POLISHING the force cone I was talking about the transition area from the rear most part of the barrel to the first part of the bore itself. Think of these scratches as liking to tarnish on silver to polish silver you use silver polish but it is so FINE it does not leave scratches . To polish the forcing cone you need to use something like J.B. bore cleaner maybe 100 strokes this stuff is so fine it will not really remove metal but rather smooth out the Microscopic scratches left by the revolver makers Tooling
I have shoot hundreds of thousand of lead bullets in match pistols Some times a new barrel will have a burr in my case a pistol 1911 Barrel I will see leading and take a bore patch type cleaning rod with big enough patch to fit very snug in the bore I rub some J.B. bore cleaner on the patch and then using about one inch strokes install from the chamber end and go fully from chamber base to about 3/8 inch of the bore I do about 100 strokes You could do thousands
with J.B. without removing metal with a revolver open the cylinder with blank cleaning rod with the end that holes a patch start the rod from the muzzle end when it comes out at the forcing cone end install patch coated with J.B. you need the patch to be tight now pull patch into the forcing cone and first 1/2 inch of bore do this 50 to 100 strokes remember it just smooths the scratch from a sharp edge to a rounded edge. . Lead itself will polish the bore and some case cleaners with walnut hulls has jeweler's rouge after years of shooting the bore will be mirror smooth and group size will get smaller.hard to wear out a barrel shooting lead bullets mild to normal loads0 -
+1, to what Karl says. Have a very knowledgeable gunsmith do it.
If the tool marks are very deep, in the forcing cone? a special ball end reamer, might be needed to remove them. Brownells sells them, specially for cleaning up forcing cones. A very light, knowledgeable, hand is required. So only the chatter/tool marks are removed.0 -
The best thing to do is find a 'smith that has a forcing cone reamer that is 11 degrees. They can change it to that and cure your problem [;)] We did mine and it cured any leading and tightened the groups up [^]
This shows you what you need to do,
www.youtube.com/watch?v=WtIBv6VIQGE0 -
It can be done as an advanced DIY project. You can use a fitted hardwood dowel with polishing compound. You ONLY GET ONE SHOT, do it wrong or too much/lopsided then it might take a new barrel to fix it. You could try shooting several hundred jacketed bullets to try and iron it in. 0 -
Polishing the forcing cone is not easy to do without removing the barrel. If you are handy and have the right tools it can be done. Many gunsmiths do not have the tools or expertise, so choose wisely before hiring someone you are not sure of.
Before spending time and money, you need to make sure that a polish job will cure the problem. If the cylinder throats are not uniform, and if their diameters do not match the bore, they could be part of the problem. They can be polished to a uniform diameter but if one or more are already too large it could make the situation worse than it already is.
In the end, you may have to learn to live with the leading. Changing bullet diameter may help. Or switch to jacketed bullets. That may be cheaper in the long run.0
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