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Rifles, Reloading, Optics, Equipment
Gunsmithing
Why dial a rifle bore within .0001"
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<blockquote data-quote="J E Custom" data-source="post: 1143740" data-attributes="member: 2736"><p>Idaho CTD. I am using your post only because you brought up some good points and not to start an argument or criticize so don't take it as an attack (Please). </p><p></p><p>I know that Most barrel makers are hesitant to give away there process and it is sometimes hard to get them to talk about it (Some processes are proprietary and they feel that that's there edge over other barrel makers. Deep hole drilling takes skill and the proper tools to be done correctly. some of the better barrel makers can/do make barrels up to 45" that are very straight.</p><p></p><p>First of all the better quality barrels are first drilled. next they are reamed several times to get the proper straightness. If this straightness is not within there tolerance, they drill it to a larger size and start the reaming process over for the larger bore size. if the barrel blank doesn't make the tolerance the second time then it is scrapped.</p><p></p><p>Once the barrel bore is straight, it is finally reamed to produce the proper bore size for rifling, then the rifling is done and only then by the better barrel makers. Cheaper barrels cant afford this much care and precision in order to sell at there price, so it is not done. They do all barrels and then grade them based on there straightness. They may have as many as 4 different grades.(You get what you pay for).</p><p></p><p>I don't think anyone really knows how much out of straightness hurts accuracy, But most know that straight is better. Also we don't have the instruments that the barrel makers have to check straightness or bore diameter and even finish. So all we can do is try to verify the quality with what tools we have. They (The good barrel makers) have lasers that can measure the entire length of the bore for straightness, we don't. but if we are diligent while check a barrel, we can tell if it is one that is within advertised specifications or very close.</p><p></p><p>I once bought 5 new Sendero barrels and after checking all of them I found barrel straightness to be .001, .003, .007 .014 and .032. I did not use the .032 barrel but was toll that the .014 would be fine. after setting the chamber back (To get consistent and clean chambers) they were all chambered in the caliber (300 RUM) with the same reamer and bedded into the laminate Sendero stocks. after completing all 4 rifles the rifles with the least run out shot the best, and oddly enough progressively worse as the run out got worse. the barrel with .014 straightness had to be replaced with a custom barrel to fall under 1/2 MOA (I am glad that I didn't use the .032 barrel).</p><p></p><p>Could some of the difference been the rifle just did not like the loads as well. Absolutely. But it was strange that they got progressively worse as the run out numbers got worse.</p><p></p><p>So I no longer except a barrel that has more than ,001 or .0015 run out. Is this to stringent? Probably. But when I get a barrel that will get below .0001 with my gauges I know I have a good one, and the outcome is in my hands.</p><p></p><p>Demand the best, and you will get the best. In my opinion, barrel making is an art if done right and consistent quality is the mark of a great barrel maker.</p><p></p><p>Everyone should visit one or more custom barrel makers and see what goes into making a great barrel and then you will understand why there are poor barrel makers that are only in it for the money.</p><p></p><p>This has been a very interesting post and as usual, I have learned a lot from it also.</p><p></p><p>Just more comments.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1143740, member: 2736"] Idaho CTD. I am using your post only because you brought up some good points and not to start an argument or criticize so don't take it as an attack (Please). I know that Most barrel makers are hesitant to give away there process and it is sometimes hard to get them to talk about it (Some processes are proprietary and they feel that that's there edge over other barrel makers. Deep hole drilling takes skill and the proper tools to be done correctly. some of the better barrel makers can/do make barrels up to 45" that are very straight. First of all the better quality barrels are first drilled. next they are reamed several times to get the proper straightness. If this straightness is not within there tolerance, they drill it to a larger size and start the reaming process over for the larger bore size. if the barrel blank doesn't make the tolerance the second time then it is scrapped. Once the barrel bore is straight, it is finally reamed to produce the proper bore size for rifling, then the rifling is done and only then by the better barrel makers. Cheaper barrels cant afford this much care and precision in order to sell at there price, so it is not done. They do all barrels and then grade them based on there straightness. They may have as many as 4 different grades.(You get what you pay for). I don't think anyone really knows how much out of straightness hurts accuracy, But most know that straight is better. Also we don't have the instruments that the barrel makers have to check straightness or bore diameter and even finish. So all we can do is try to verify the quality with what tools we have. They (The good barrel makers) have lasers that can measure the entire length of the bore for straightness, we don't. but if we are diligent while check a barrel, we can tell if it is one that is within advertised specifications or very close. I once bought 5 new Sendero barrels and after checking all of them I found barrel straightness to be .001, .003, .007 .014 and .032. I did not use the .032 barrel but was toll that the .014 would be fine. after setting the chamber back (To get consistent and clean chambers) they were all chambered in the caliber (300 RUM) with the same reamer and bedded into the laminate Sendero stocks. after completing all 4 rifles the rifles with the least run out shot the best, and oddly enough progressively worse as the run out got worse. the barrel with .014 straightness had to be replaced with a custom barrel to fall under 1/2 MOA (I am glad that I didn't use the .032 barrel). Could some of the difference been the rifle just did not like the loads as well. Absolutely. But it was strange that they got progressively worse as the run out numbers got worse. So I no longer except a barrel that has more than ,001 or .0015 run out. Is this to stringent? Probably. But when I get a barrel that will get below .0001 with my gauges I know I have a good one, and the outcome is in my hands. Demand the best, and you will get the best. In my opinion, barrel making is an art if done right and consistent quality is the mark of a great barrel maker. Everyone should visit one or more custom barrel makers and see what goes into making a great barrel and then you will understand why there are poor barrel makers that are only in it for the money. This has been a very interesting post and as usual, I have learned a lot from it also. Just more comments. J E CUSTOM [/QUOTE]
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Why dial a rifle bore within .0001"
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