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Rifles, Reloading, Optics, Equipment
Reloading
Tumbleing loaded ammo ???
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<blockquote data-quote="Greyfox" data-source="post: 1115225" data-attributes="member: 10291"><p>I think that the far bigger issue is the effect on specific characteristics of the powder. There can be no question that the tumbling that's sufficient enough to polish dull brass can effect the physical make-up of the particle. The question is whether the tumbling effects the performance of the rifle. Maybe not when shooting deer at 100-200 yards. Very possible if you extend your range to 1000 yards. Why take the chance? IMO.</p><p> </p><p>This is an excerpt from a chemistry journal outlining the composition of smokeless powder, apparently a very sophisticated process. Of particular importance are the physical coatings that control the performance characteristics of the particle.</p><p></p><p><strong>Composition and Manufacturing</strong></p><p></p><p>The major classes of compounds in smokeless propellants include energetics, stabilizers, plasticizers, flash suppressants, deterrents, opacifiers, and dyes (Bender 1998; Radford Army Ammunition Plant 1987).</p><p></p><p>Energetics facilitate the explosion. The base charge is nitrocellulose, a polymer that gives body to the powder and allows extrudability. The addition of nitroglycerine softens the propellant, raises the energy content, and reduces hygroscopicity. Adding nitroguanidine reduces flame temperature, embrittles the mixture at high concentration, and improves energy-flame temperature relationship.</p><p></p><p></p><p>Stabilizers prevent the nitrocellulose and nitroglycerine from decomposing by neutralizing nitric and nitrous acids that are produced during decomposition. If the acids are not neutralized, they can catalyze further decomposition. Some of the more common stabilizers used to extend the safe life of the energetics are diphenylamine, methyl centralite, and ethyl centralite.</p><p></p><p></p><p>Plasticizers reduce the need for volatile solvents necessary to colloid nitrocellulose, soften the propellant, and reduce hygroscopicity. Examples of plasticizers include nitroglycerine, dibutyl phthalate, dinitrotoluene, ethyl centralite, and triacetin.</p><p></p><p></p><p>Flash suppressants interrupt free-radical chain reaction in muzzle gases and work against secondary flash. They are typically alkali or alkaline earth salts that either are contained in the formulation of the propellant or exist as separate granules.</p><p></p><p></p><p>Deterrents coat the exterior of the propellant granules to reduce the initial burning rate on the surface as well as to reduce initial flame temperature and ignitability. The coating also broadens the pressure peak and increases efficiency. Deterrents may be a penetrating type such as Herkoteâ, dibutyl phthalate, dinitrotoluene, ethyl centralite, methyl centralite, or dioctyl phthalate; or an inhibitor type such as Vinsolâ resin.</p><p></p><p></p><p>Opacifiers enhance reproducibility primarily in large grains and keep radiant heat from penetrating the surface. They may also enhance the burning rate. The most common opacifier is carbon black.</p><p></p><p></p><p>Dyes are added mainly for identification purposes.</p><p></p><p></p><p>Other ingredients may be one of the following:</p><p>A graphite glaze used to coat the powder to improve flow and packing density as well as to reduce static sensitivity and increase conductivity</p><p>Bore erosion coatings applied as a glaze to reduce heat transfer to the barrel, but uncommon in small-arms propellants</p><p>Ignition aid coatings that are most commonly used in ball powders to improve surface oxygen balance</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1115225, member: 10291"] I think that the far bigger issue is the effect on specific characteristics of the powder. There can be no question that the tumbling that's sufficient enough to polish dull brass can effect the physical make-up of the particle. The question is whether the tumbling effects the performance of the rifle. Maybe not when shooting deer at 100-200 yards. Very possible if you extend your range to 1000 yards. Why take the chance? IMO. This is an excerpt from a chemistry journal outlining the composition of smokeless powder, apparently a very sophisticated process. Of particular importance are the physical coatings that control the performance characteristics of the particle. [B]Composition and Manufacturing[/B] The major classes of compounds in smokeless propellants include energetics, stabilizers, plasticizers, flash suppressants, deterrents, opacifiers, and dyes (Bender 1998; Radford Army Ammunition Plant 1987). Energetics facilitate the explosion. The base charge is nitrocellulose, a polymer that gives body to the powder and allows extrudability. The addition of nitroglycerine softens the propellant, raises the energy content, and reduces hygroscopicity. Adding nitroguanidine reduces flame temperature, embrittles the mixture at high concentration, and improves energy-flame temperature relationship. Stabilizers prevent the nitrocellulose and nitroglycerine from decomposing by neutralizing nitric and nitrous acids that are produced during decomposition. If the acids are not neutralized, they can catalyze further decomposition. Some of the more common stabilizers used to extend the safe life of the energetics are diphenylamine, methyl centralite, and ethyl centralite. Plasticizers reduce the need for volatile solvents necessary to colloid nitrocellulose, soften the propellant, and reduce hygroscopicity. Examples of plasticizers include nitroglycerine, dibutyl phthalate, dinitrotoluene, ethyl centralite, and triacetin. Flash suppressants interrupt free-radical chain reaction in muzzle gases and work against secondary flash. They are typically alkali or alkaline earth salts that either are contained in the formulation of the propellant or exist as separate granules. Deterrents coat the exterior of the propellant granules to reduce the initial burning rate on the surface as well as to reduce initial flame temperature and ignitability. The coating also broadens the pressure peak and increases efficiency. Deterrents may be a penetrating type such as Herkoteâ, dibutyl phthalate, dinitrotoluene, ethyl centralite, methyl centralite, or dioctyl phthalate; or an inhibitor type such as Vinsolâ resin. Opacifiers enhance reproducibility primarily in large grains and keep radiant heat from penetrating the surface. They may also enhance the burning rate. The most common opacifier is carbon black. Dyes are added mainly for identification purposes. Other ingredients may be one of the following: A graphite glaze used to coat the powder to improve flow and packing density as well as to reduce static sensitivity and increase conductivity Bore erosion coatings applied as a glaze to reduce heat transfer to the barrel, but uncommon in small-arms propellants Ignition aid coatings that are most commonly used in ball powders to improve surface oxygen balance [/QUOTE]
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