K frames split the barrel at the bottom of the forcing cone, just above the crane. You will encounter many revolvers with extremely short, almost nonexistent forcing cones. According to forum such cases are handled quick and painless in usa by ruger. 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. Cutters also sold separately and can be interchanged in the handle. The crack in the pictured forcing cone demands a barrel change.
They had some split forcing cones when the police started using the 110gr cartridges. Some of that seems logical, but it would seem to be more of a gas cutting issue than cracking the forcing cone. The gunsmith had to shave some off the rear of the barrel to get the proper cylinder gap. 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. 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. My concern is the reduced thickness resulting from flattening a rounded surface. The high velocity 125gr loads were hitting the forcing cone at a much. Highest quality gunsmith tools, including revolver forcing cone cutters at pacific tool and gauge.
It plays a slightly different role in each type of gun. What happens to all of the model 19s with cracked forcing. In most production shotguns this forcing cone is very short and at a very steep angle. Cracks usually occurred at the forcing cones 6 oclock position. Beyond that i would speculate that clean living and eschewing light bullets has led to my so far success. This conclusively proves that a single revolver within a narrowly defined usage pattern has yet to crack its forcing cone. I am the original owner of this pistol, having been given to me in high school about 1982, its a model 194. If the revolver spits or leads, or seems to have accuracy problems then maybe something should be done. Revolver gurus pls check out my forcing cone firearms.
How to use revolver forcing cone cutting tools to improve accuracy. I seen posted ot the internet wo the cone cracking ps. Another issue is the smoothness or roughness of the forcing cone. I have got, and shot a lot of ks, but have never seen one.
In terms of measuring any offset from inside the bore, probably less than. The model 69 is able to exist only because it has a two piece bbl which allows for a thicker forcing cone. A rough, unpolished forcing cone is a magnet for plastic wadding and residue accumulation, which in turn attracts moisture and causes rust. 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. There isnt much bevel left, and it spits a little bit now. Results would likely be best with jacketed bullets. Ok, calling the experts on magnum revolvers i was cleaning up the old. Oct 23, 2011 how to use revolver forcing cone cutting tools to improve accuracy.
When introduced, the kframe revolvers, due to their many desirable. In summary, the issue with the k frame magnums is not the width of the barrel. Some of the pics are misleading but there are no lead or carbon deposits. If anyone knows about the smaller parts that were replaced, i would love to hear about it. 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. Youll probably find one where somebody replaced their barrel with a different length one and they kept the original barrel. 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 isnt a concern about forcing cone erosion that would be honest wear, more of a concern about premature forcing cone cracks.
The 357mag k frames wereare susceptible to this and that is why it is recommended to not use superheavy or overthetop loads with them. Revolver gurus pls check out my forcing cone discussion in revolver handguns started by bluez, may 8, 2017. Are cracked forcing cones the result of poor maintenance on revolvers. If youre interested in how this happened, then please read below. This is what is happening now with my accurized revolver. This flat made the bottom of the forcing cone a little thin, which was no problem for the. 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. Includes the 22 degree forcing cone cutter, rod, thandle and bushing where needed. 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.
I am not so sure about the 5 degree forcing cones as i have never measured the few. Cracked forcing cone the firearms forum the buying. What is the tolerance of a revolver cylinder being in line with the barrel. Another centerfire revolver, another cracked forcing cone.
Not for any other reason except that is my 38 cal bullet of choice. Forcing cone crack 2nd update from mri singleactions. Steel cutting tool removes burrs from the outer edge of the forcing cone to improve accuracy. Yes if a person does not clean the forcing cone properly. For those with questions on how to clean a revolver, we got answers to keep that. 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. The only way to fix a cracked forcing cone is to replace the barrel. Jul 03, 2012 the forcing cone is the barrel taper from.
I am getting so much confusing info about reaming forcing cones on ruger sbh. This is a discussion on cracked forcing cone on gp100. It did a amazing job and improved the guns accuracy especially with lead bullets. 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. Now, i heard that after enough magnum loads the forcing cone cracks and that other parts of the revolver begin to wear out. Love them or hate them, thats just an undeniable advantage of the two piece system. Love the gun and worth rebarrelling whether i pay or they pay. I did ask them to check the timing and to give it a solid once over, and this is what they replaced. What is the tolerance of a revolver cylinder being in line. 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. 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. 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.
The only proof is firing the revolver, but theres nothing wrong with the forcing cone in the photo. 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. 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. Otherwise, its a dandy revolver and is great fun to shoot. All ptg reamers and cutting tools are designed to work with petroleumbased lubricant. Cleaning my 6 stainless gp100 a few days ago and noticed that the forcing cone was. I am not so sure i can discern any difference in accuracy between the 18 and 11 degree cones in. If the forcing cone cracks, the revolver is basically a parts gun. 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. Any revolver is capable of cracking a forcing cone, if the wrong ammo is used, just like anything mechanical can fail. I put this revolver up there with my model 29 44mag. My son sent me a blip from another forum but i dont have all the tm stuff to copy here.
Use on the chamber throat to help rounds drop in easily. These guns can be helped greatly by using the brownells revolver chamfer tools. 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. 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. Dear technoid, greetings from a beginning shotgunner. A revolver has a vent between cylinder and forcing cone so excess pressure is relieved at that point. This whole thing about modifying forcing cones is all about how gradual a taper this funnel should be. A forcing cone is a part of a firearm, usually either a revolver or a shotgun. Mar 11, 2009 a forcing cone is a part of a firearm, usually either a revolver or a shotgun. We lengthen the forcing cone to 3 inches and and finish it with a mirror polish. Occasionally, you may encounter a revolver with a forcing cone that is cut too deeply when measured with our plug gauges.
I must have 3000 rounds through it and not a sign of battering or cracking. 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. 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 crack in the pictured forcing cone demands a barrel. It wasnt the frames cracking it was the forcing cones splitting. Does anybody have a good picture of the elusive cracked forcing cone of a kframe. For some reason, it cracked more stainless forcing cones than blued. Jan 30, 2005 cleaning the forcing cone can be done easily with a caliber specific lewis lead removal kit. The kit has a rod, two jags and a set of screens for cleaning.
Misaligned canted barrels and timing with some occasional forcing cone cracks. Revolver gurus pls check out my forcing cone firearms talk. Some of the pics are misleading but there are no lead or. Apr 10, 2020 my son sent me a blip from another forum but i dont have all the tm stuff to copy here. 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. This is the worst forcing cone erosion i seen posted ot the internet wo the cone cracking ps. Which may help explain the occurrence of cracking through the forcing cone, as occasioned in a pair of. Revolver deburring tool includes cutter and handle.
The lead deposits can cause thot spots which can result in a cracked forcing cone. My beloved sw model 19 357 developed a cracked forcing cone yesterday. And that is probably true for any revolver not just the model 19. This is really hard to tell if its intentional or not on this particular specimen. In a revolver, the cartridge is kept entirely in the cylinder during firing. I know you and wgs have explained the kframe thing to me before, i just forgot about the flat spot being the issue. It wasis a good old gun, and nothing ever broke, forcing cone didnt crack,etc. I have read up on the forcing cone cracking issue, but am not sure what to make of it really.
Waterbased lubricant can give acceptable results, however the life of the tool will be reduced. I had a gp100 that did the same thing, and now a super blackhawk. That forcing cone minus the obvious crack shows the results of a steady diet of magnum loaded rounds. 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. Ideal angle for revolver forcing cone cast bullet forum. Also i believe the cracked forcing cones are from high round counts through revolvers and again lack of cleaning them. Revolver forcing cone cutters pacific tool and gauge. 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. Revolver forcing cone tools 44 caliber 11 degree includes the 11 degree forcing cone cutter, rod, thandle and bushing where needed. Wed all like glossy forcing cones, but the truth is it doesnt matter much especially in a snubby. A lot of this could be the lack of cleaning deposits off the forcing cone. The 80s saw one of the worst revolver battles fought.
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