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Rifles, Reloading, Optics, Equipment
Gunsmithing
Barrel contour discussion
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<blockquote data-quote="jrock" data-source="post: 2025741" data-attributes="member: 78569"><p>I noticed two things about your post</p><p>"...optimize the performance for a given weight."</p><p>"...shows that barrel weight over other things largely determines performance."</p><p></p><p>I tend to focus on rigidity as the main point of discussion. The sinusoidal movement of the barrel is what makes the accuracy node. A lower amplitude is a stiffer barrel but accuracy can still be obtained on a flexible barrel as long as the ammo is tuned or a barrel tuner installed. </p><p>If limiting weight is the goal of performance, I found a fluted #2 (0.60" muzzle) is just as rigid but slightly lighter than a #1. That was based on fluting depths I see manufactures publish. However, fluted contours larger than #2 are less rigid and heavier than the next size down unfluted. Then there is the fact that it may be difficult to find a barrel manufacturer that will flute a contour less than a #3 (~0.63). Weatherby has a fluted barrel that has a muzzle diameter of 0.575" and its very light.</p><p></p><p>If the barrel is going to be threaded, then the minimum muzzle diameter for threading and an appropriate shoulder abutment must be considered. Thunder Beast recommends a minimum 0.60" muzzle diameter with 1/2" threads. I personally don't like the threaded barrels that are flared out at the muzzle to provide a larger shoulder abutment. They don't look right to me (since the OP mentioned looks count).</p><p></p><p>A gunsmithing book I have states, that the straight shank of the barrel should extend to the cartridge shoulder. However, there are many examples of factory guns, including Rem 700, that start the radius at the recoil lug. I'd like to find some more technical information on that considering it doesn't appear to be "required" for strength. For rigidity, the more shank the barrel has, the stiffer it will be. Stiffness closer to the receiver has move value from a mechanics and materials perspective. I have not seen or heard of anyone testing shank profiles for accuracy. It my not matter if the barrel tapers quickly. </p><p> </p><p>For hunting guns, I think this discussion is a valuable one. For competition, not sure it matters as they are all heavy. POI shifts from a heated barrel also matter. Stiffness and mass both help with that.</p></blockquote><p></p>
[QUOTE="jrock, post: 2025741, member: 78569"] I noticed two things about your post "...optimize the performance for a given weight." "...shows that barrel weight over other things largely determines performance." I tend to focus on rigidity as the main point of discussion. The sinusoidal movement of the barrel is what makes the accuracy node. A lower amplitude is a stiffer barrel but accuracy can still be obtained on a flexible barrel as long as the ammo is tuned or a barrel tuner installed. If limiting weight is the goal of performance, I found a fluted #2 (0.60" muzzle) is just as rigid but slightly lighter than a #1. That was based on fluting depths I see manufactures publish. However, fluted contours larger than #2 are less rigid and heavier than the next size down unfluted. Then there is the fact that it may be difficult to find a barrel manufacturer that will flute a contour less than a #3 (~0.63). Weatherby has a fluted barrel that has a muzzle diameter of 0.575" and its very light. If the barrel is going to be threaded, then the minimum muzzle diameter for threading and an appropriate shoulder abutment must be considered. Thunder Beast recommends a minimum 0.60" muzzle diameter with 1/2" threads. I personally don't like the threaded barrels that are flared out at the muzzle to provide a larger shoulder abutment. They don't look right to me (since the OP mentioned looks count). A gunsmithing book I have states, that the straight shank of the barrel should extend to the cartridge shoulder. However, there are many examples of factory guns, including Rem 700, that start the radius at the recoil lug. I'd like to find some more technical information on that considering it doesn't appear to be "required" for strength. For rigidity, the more shank the barrel has, the stiffer it will be. Stiffness closer to the receiver has move value from a mechanics and materials perspective. I have not seen or heard of anyone testing shank profiles for accuracy. It my not matter if the barrel tapers quickly. For hunting guns, I think this discussion is a valuable one. For competition, not sure it matters as they are all heavy. POI shifts from a heated barrel also matter. Stiffness and mass both help with that. [/QUOTE]
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