I am not so sure i can discern any difference in accuracy between the 18 and 11 degree cones in. Specifically, the bullet must be one to two thousandths larger than the bore, the bore must be uniform from forcing cone to muzzle, the muzzle must be properly crowned, and. What is the tolerance of a revolver cylinder being in line with the barrel. Cracked forcing cone the firearms forum the buying. The only proof is firing the revolver, but theres nothing wrong with the forcing cone in the photo. It plays a slightly different role in each type of gun. Love them or hate them, thats just an undeniable advantage of the two piece system. Ok, calling the experts on magnum revolvers i was cleaning up the old. The 357mag k frames wereare susceptible to this and that is why it is recommended to not use superheavy or overthetop loads with them. Apr 10, 2020 my son sent me a blip from another forum but i dont have all the tm stuff to copy here. K frames split the barrel at the bottom of the forcing cone, just above the crane. Cracks usually occurred at the forcing cones 6 oclock position. A rough, unpolished forcing cone is a magnet for plastic wadding and residue accumulation, which in turn attracts moisture and causes rust.
How to use revolver forcing cone cutting tools to improve accuracy. That forcing cone minus the obvious crack shows the results of a steady diet of magnum loaded rounds. Steel cutting tool removes burrs from the outer edge of the forcing cone to improve accuracy. Revolver gurus pls check out my forcing cone discussion in revolver handguns started by bluez, may 8, 2017. Results would likely be best with jacketed bullets.
In terms of measuring any offset from inside the bore, probably less than. Beyond that i would speculate that clean living and eschewing light bullets has led to my so far success. It did a amazing job and improved the guns accuracy especially with lead bullets. Love the gun and worth rebarrelling whether i pay or they pay. Youll probably find one where somebody replaced their barrel with a different length one and they kept the original barrel. The kit has a rod, two jags and a set of screens for cleaning. Cleaning my 6 stainless gp100 a few days ago and noticed that the forcing cone was.
Its pretty easy to spot where most of the gas cutting occurs on a revolver between the cylinder and forcing cone on the top strap, but then you have to envision that cutting line extending 360degrees. If the forcing cone cracks, the revolver is basically a parts gun. The front of the bullet must, of necessity, be behind the rear end of the barrel since the cylinder must be able to rotate the bullet into firing position behind the barrel. In summary, the issue with the k frame magnums is not the width of the barrel. Use on the chamber throat to help rounds drop in easily. When introduced, the kframe revolvers, due to their many desirable. A revolver has a vent between cylinder and forcing cone so excess pressure is relieved at that point. The only way to fix a cracked forcing cone is to replace the barrel.
Bullet jumps cylinder gap into barrel forcing cone. Cutters also sold separately and can be interchanged in the handle. Are cracked forcing cones the result of poor maintenance on revolvers. The model 69 is able to exist only because it has a two piece bbl which allows for a thicker forcing cone. My beloved sw model 19 357 developed a cracked forcing cone yesterday.
These guns can be helped greatly by using the brownells revolver chamfer tools. There isnt much bevel left, and it spits a little bit now. After the lframe came out and the kframe magnum forcing cone cracking issue began to be bandied about in the mid1980s, i began looking for forcing cone issues in model 19s and other kframe magnums at gun shows. The k frame magnums have a flat section of the forcing cone that is prone to cracking with the use of hypervelocity lightweight 357 magnum ammo such as 110 or 125 grain. I intend to load nothing but 158gr for of any 38357 simply because i can stock up on one bullet, and i am a firm believer in heavy bullets vs. This whole thing about modifying forcing cones is all about how gradual a taper this funnel should be.
I am not so sure about the 5 degree forcing cones as i have never measured the few. For example, could you shoot hot 125gr 357 mag loads in a model 619 l frame or a model 28 n frame, or hot 185gr 44 mag loads in a model 629 also n frame without any. Notice even the 44 special l framed smiths had trouble with forcing cones cracking with the one piece bbls when used with lighter faster relatively jhps. I seen posted ot the internet wo the cone cracking ps. I had a gp100 that did the same thing, and now a super blackhawk. Not for any other reason except that is my 38 cal bullet of choice. Waterbased lubricant can give acceptable results, however the life of the tool will be reduced. Mar 11, 2009 a forcing cone is a part of a firearm, usually either a revolver or a shotgun. For some reason, it cracked more stainless forcing cones than blued. I have read much of the shotgun report and subsequently had almost decided to send my remington 1100 special field in to have the forcing cones lengthened and chokes installedit has a modified fixed choke in a 28 barrel. Forcing cone crack 2nd update from mri singleactions. The area in a shotgun barrel just in front of the chamber that directs the shot load into the bore is called the forcing cone.
They had some split forcing cones when the police started using the 110gr cartridges. I did ask them to check the timing and to give it a solid once over, and this is what they replaced. Some of the pics are misleading but there are no lead or carbon deposits. Some of that seems logical, but it would seem to be more of a gas cutting issue than cracking the forcing cone. Misaligned canted barrels and timing with some occasional forcing cone cracks. Revolver forcing cone tools 44 caliber 11 degree includes the 11 degree forcing cone cutter, rod, thandle and bushing where needed. We lengthen the forcing cone to 3 inches and and finish it with a mirror polish. Ideal angle for revolver forcing cone cast bullet forum. This conclusively proves that a single revolver within a narrowly defined usage pattern has yet to crack its forcing cone. Even copper bullets will build up fouling on the forcing cone and the lewis kit is about the only way to really get it clean. What happens to all of the model 19s with cracked forcing. The kit includes a brass tip with a rubber bushing to clean the bore and a coneshaped tip thats used to clean the fouling off the critical revolver forcing cone at the rear of the barrel. In most production shotguns this forcing cone is very short and at a very steep angle. This is really hard to tell if its intentional or not on this particular specimen.
This is a discussion on cracked forcing cone on gp100. Jul 03, 2012 the forcing cone is the barrel taper from. I put this revolver up there with my model 29 44mag. The high velocity 125gr loads were hitting the forcing cone at a much. Revolver forcing cone cutters pacific tool and gauge. The k frame magnums have a flat section of the forcing cone that is prone to cracking with the use of hypervelocity lightweight 357. This is the worst forcing cone erosion i seen posted ot the internet wo the cone cracking ps. The forcing cone guides the projectile out of the larger chamber into the smaller bore. Anyway the question was concerning cracking the forcing cone of a sec 6 using what seemed to me to be a really heavy load with a 110 grain bullet. Yes if a person does not clean the forcing cone properly. I am the original owner of this pistol, having been given to me in high school about 1982, its a model 194.
I am getting so much confusing info about reaming forcing cones on ruger sbh. Includes the 22 degree forcing cone cutter, rod, thandle and bushing where needed. The forcing cone looks rather rough and was thinking of getting a brass fc lap to smooth it up some but dont know what the angle should be. The 80s saw one of the worst revolver battles fought. For example all the weak parts of the design are in fact much beefier than the j frames, which are also in 357 and often used with 125 grainers. The crack in the pictured forcing cone demands a barrel change. I know you and wgs have explained the kframe thing to me before, i just forgot about the flat spot being the issue. There is no doubt in my mind that as great as the k frame magnum is the one weakness is the flat spot at the 6 a clock position. Revolver gurus pls check out my forcing cone firearms talk.
You will encounter many revolvers with extremely short, almost nonexistent forcing cones. In order to gain maximum accuracy from any revolver, the diameter of the bullets, the cylinder throats, forcing cone, and barrel all must be in harmony. Another issue is the smoothness or roughness of the forcing cone. This flat spot had to be made so the barrel would clear the cylinder forward bearing surface, and it was later discovered that repeated firing of the lighter. Cleaning my 6 stainless gp100 a few days ago and noticed that the forcing cone was cracked. My concern is the reduced thickness resulting from flattening a rounded surface. Cleaning the forcing cone can be done easily with a caliber specific lewis lead removal kit. I have viewed a sectioned revolver barrel with stacked obstructing bullets from about an inch from the muzzle back to just forward fo the forcing cone entrance.
Which may help explain the occurrence of cracking through the forcing cone, as occasioned in a pair of. This isnt a concern about forcing cone erosion that would be honest wear, more of a concern about premature forcing cone cracks. Occasionally, you may encounter a revolver with a forcing cone that is cut too deeply when measured with our plug gauges. What is the tolerance of a revolver cylinder being in line. They are marked 11 degree, but they are twice as steep as the brownells 11 degree cutter.
This flat made the bottom of the forcing cone a little thin, which was no problem for the. This is what is happening now with my accurized revolver. Some of the pics are misleading but there are no lead or. Cracked forcing cone page 2 the firearms forum the. Also i believe the cracked forcing cones are from high round counts through revolvers and again lack of cleaning them. I must have 3000 rounds through it and not a sign of battering or cracking. Gunwear is caused by erosion and corrosion of the gun barrel. I have read up on the forcing cone cracking issue, but am not sure what to make of it really.
It wasis a good old gun, and nothing ever broke, forcing cone didnt crack,etc. A lot of this could be the lack of cleaning deposits off the forcing cone. The gunsmith had to shave some off the rear of the barrel to get the proper cylinder gap. With these very detailed and complete instructions plus the brownells revolver chamfering tool kit and the other accessories you can now make forcing cone work an important part of the service you offer your customers and a profitable part of your operation. Wed all like glossy forcing cones, but the truth is it doesnt matter much especially in a snubby. The lead deposits can cause thot spots which can result in a cracked forcing cone. It also, obviously, makes it harder for the load to pass smoothly through the forcing cone to the bore. Dear technoid, greetings from a beginning shotgunner. Any revolver is capable of cracking a forcing cone, if the wrong ammo is used, just like anything mechanical can fail. Eventually the cylinder axis pin became elongated, making it difficult to close the cylinder and requiring replacement, but i have yet to crack the forcing cone. In a revolver, the cartridge is kept entirely in the cylinder during firing. Otherwise, its a dandy revolver and is great fun to shoot. According to forum such cases are handled quick and painless in usa by ruger.
Revolver gurus pls check out my forcing cone firearms. For those with questions on how to clean a revolver, we got answers to keep that. If the revolver spits or leads, or seems to have accuracy problems then maybe something should be done. Does anybody have a good picture of the elusive cracked forcing cone of a kframe.
One jag is cone shaped to clean the forcing cone with the screen and the other jag is designed to pulled through the barrel from the chamber to the muzzle. Now, i heard that after enough magnum loads the forcing cone cracks and that other parts of the revolver begin to wear out. Highest quality gunsmith tools, including revolver forcing cone cutters at pacific tool and gauge. Heavy bullets impose stress on a revolver frame which light bullets at the same pressure do not. The kit includes a brass tip with a rubber bushing to clean the bore and a cone shaped tip thats used to clean the fouling off the critical revolver forcing cone at the rear of the barrel. It wasnt the frames cracking it was the forcing cones splitting. Another centerfire revolver, another cracked forcing cone. Jan 30, 2005 cleaning the forcing cone can be done easily with a caliber specific lewis lead removal kit. Jframe 38357 revolvers hold 5 shots while kframes in hold six. If anyone knows about the smaller parts that were replaced, i would love to hear about it. Revolver deburring tool includes cutter and handle.
All ptg reamers and cutting tools are designed to work with petroleumbased lubricant. And that is probably true for any revolver not just the model 19. Oct 23, 2011 how to use revolver forcing cone cutting tools to improve accuracy. Forcing cone tools rentals archives 4d reamer rentals. If youre interested in how this happened, then please read below. The crack in the pictured forcing cone demands a barrel.
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