As the cutter was advanced through the barrel it twisted at a uniform rate governed by the pitch. The first cut was shallow but as repeated cuts were made the cutter points were gradually expanded—the blades were in slots in a wooden dowel which were gradually packed out with slips of paper—until the required depth was obtained. The process was finished off by casting a slug of molten lead into the barrel, withdrawing it and using it with a paste of emery and oil to smooth the bore. These lands and grooves can vary in number, depth, shape, direction of twist right or leftand twist rate.
What is your opinion of the deep cryogenic processing of barrels? What is your opinion of the use of moly coated bullets? What are the differences between chrome-moly barrels and stainless steel barrels?
What are the differences between 3 Groove and 6 Groove Barrels? Why do you have so many choices in twist rates?
What is hand lapping? Why is there a saw cut near the muzzle end of your rifle barrels? Does Fluting cause stress in a rifle barrel? What does Lilja Rifle Barrels think of the use of bore solvents with ammonia? What are the advantages to purchasing a Lilja 22 rimfire drop-in barrel?
What federal laws and taxes apply to rifle barrels? Can stainless steel barrels be safely fired in sub zero temperatures? What do you think of bore sighting equipment that slips into the muzzle? What is the difference between a drop-in barrel and a barrel that needs gunsmithing?
Does Lilja have tours of their shop and facilities? Does Lilja have a recommended cleaning and break-in procedure? Does Lilja use a video borescope? The cryogenic treating of barrels at a temperature of degrees below zero has been a hot topic of discussion lately.
Our short answer is that it will not harm your barrel but we are not completely convinced of all of the benefits claimed by some. The only benefits that we Why gun barrels are rifled are likely to result from the treatment are possibly a longer barrel life and a slight increase in machinability.
Claims for increased accuracy through stress relief are not founded in our opinion. When barrels are button rifled no material is removed, it is just displaced.
This causes stresses to be formed in the steel. If these stresses are not removed problems will result. These negative conditions include warping of the barrel during other machining operations, an increase in the bore diameter towards the muzzle end of the barrel during the contouring phase, and in the extreme, lengthwise splitting of the barrel.
Also, if there are stresses remaining in the barrel they can be slowly released as a barrel warms up during firing.
This causes the barrel to actually move during the course of shooting, causing inaccuracy. In our testing we have found that the only effective means to completely remove the types of stresses introduced during rifling are with conventional heat treating using elevated temperatures.
The degree treatment alone will not remove these stresses. The key words here are remaining stresses. We do know through our testing that the cold treatment alone will not remove any significant amount of stress and that the problems outlined above concerning stress will remain in the barrel.
So, because of the very limited amount of stress that could be removed with the cold treatment if the barrel has been properly stress relieved with heat as our barrels are we do not believe that there can be much if any accuracy benefit to the degree treatment of our barrels.
It is for these reasons that we feel the cold process has very little potential for increasing the accuracy of our barrels. In our opinion, other than the removal of these stresses, there are no other mechanical factors involved that could benefit accuracy in a rifle barrel, resulting from a heat treating operation, either hot or cold.
For reasons not completely understood however there may be an increase in the wear resistance of the steel. This type of wear however does not contribute greatly to barrel erosion. We invite you to read our comments on this type of barrel wear in the question regarding the use of moly coated bullets.
Another possible side benefit to the freezing process is a slight increase in its machinability. Since I originally wrote this an excellent article by Kevin Thomas of Sierra Bullets was printed in the September, issue of Precision Shooting magazine. Thomas found, in a controlled test, that there was little benefit to deep freezing match grade barrels.
He could see no difference in accuracy but probably a slight increase in useful life. I would encourage anyone interested in this subject to take a look at this article.
First, as described in our section on barrel break-in, we do not recommend the use of moly coated bullets for break-in. The break-in process requires the use of an uncoated jacket if it is to be successful.Hammer forged barrels do not have a very visible presence in the accurate gun world, so I will confine this discussion as to the relative merits of cut versus button rifled barrels.
If it is so easy to rifle barrels using a button, why do some barrel makers persist in the difficult, time consuming art of cut rifling?
Browse all new and used Gun Accessories for sale and buy with confidence from Guns International. The two most common Remington barrels are either the rifled barrel or the smoothbore.
Rifled barrels are good for shooting sabot slugs like Premier Accutip Slug, Copper Solid Slug etc. Why We Offer "Accuracy" Barrels There are three reasons why customers come to us for a custom Encore barrel: The first two are either to get a different chambering or barrel length than what's offered by .
FAQ. Q. What is your opinion of the deep cryogenic processing of barrels? Q. What is your opinion of the use of moly coated bullets? Q. What is your opinion of the “BlackStar process and Fire Lapping”? Q. What are the differences between chrome-moly barrels and stainless steel barrels?
Q. Building Hitler’s supergun: the plot to destroy London and why it failed.