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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Wear
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<blockquote data-quote="Kevin Thomas" data-source="post: 481921" data-attributes="member: 15748"><p>T3, </p><p> </p><p>For the most part, civillian powders fall into one of two categories; single based and double based. Both are generally based on nitrated cellulose, but double based powders have nitroglycerine added to the mix. This gives them higher energy per grain, but also increases flame temperature. This can be pretty drastic with some of the higher concentrations (call it 20-25% nitroglycerine) so you do pay a price. Hey, no such thing as a free lunch. In general, ball powders are double based, while extruded tubular powders are single based. Both work, both give good results, so don't get too carried away with the flame temperature issue.</p><p> </p><p>Primers can make a huge difference, but we're talking more in terms of SD, accuracy and uniformity here than barrel wear. Frankly, I doubt you'll find them having too much of an impact on barrel wear (I'd be flabbergasted, anyway) compared to the other larger issues of pressure, flame temops and bullet weights. I think the real issue ciomes down to expansion ratios. cartridges delivering very low expansion ratios are going to be harder on barrels, period. They're also a lot less efficient. They do, however, unfailingly deliver higher levels of velocity and energy. Don't confuse efficiency with effectivness. They aren't the same, and often find themselves pulling in opposite directions. Nature of the beast.</p><p> </p><p>I'm wondering if you're not confusing corrosive primers with the comments you've posted here? Mercuric and corrosive primers are a thing of the past with US commercial ammo and components, but you can still find them in surplus stuff out there. Corrosive primers utilized potassium chloride as a primary component. Essentially, firing a round primed with these set a nice little coating of salt in your barrel, which in turn invited every last drop of moisture in the air to come and attack your barrel, right now. Most modern cleaning solvents won't remove this, and the barrels need to be cleaned with a water based solvent (or even just straight water) to dissolve and remove this residue. A good coating of oil was in order after cleaning, which I'm sure you understand. Mercuric primers are another matter, in that they do no real damage to the barrel, but will render the brass useless upon firing. Actually, they even weaked the brass over time even if they weren't fired. The mercury formed an amalgamation with the brass and created all manner of problems. They were also frequently used in conjuntion with the potassium chloride, which made the primer both mercuric and corrosive. </p><p> </p><p>I've never heard of anything relating to sealants creating problems with erosion, but hey, always willing to learn something. Like to hear more about this, if anyone has anything to offer.</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 481921, member: 15748"] T3, For the most part, civillian powders fall into one of two categories; single based and double based. Both are generally based on nitrated cellulose, but double based powders have nitroglycerine added to the mix. This gives them higher energy per grain, but also increases flame temperature. This can be pretty drastic with some of the higher concentrations (call it 20-25% nitroglycerine) so you do pay a price. Hey, no such thing as a free lunch. In general, ball powders are double based, while extruded tubular powders are single based. Both work, both give good results, so don't get too carried away with the flame temperature issue. Primers can make a huge difference, but we're talking more in terms of SD, accuracy and uniformity here than barrel wear. Frankly, I doubt you'll find them having too much of an impact on barrel wear (I'd be flabbergasted, anyway) compared to the other larger issues of pressure, flame temops and bullet weights. I think the real issue ciomes down to expansion ratios. cartridges delivering very low expansion ratios are going to be harder on barrels, period. They're also a lot less efficient. They do, however, unfailingly deliver higher levels of velocity and energy. Don't confuse efficiency with effectivness. They aren't the same, and often find themselves pulling in opposite directions. Nature of the beast. I'm wondering if you're not confusing corrosive primers with the comments you've posted here? Mercuric and corrosive primers are a thing of the past with US commercial ammo and components, but you can still find them in surplus stuff out there. Corrosive primers utilized potassium chloride as a primary component. Essentially, firing a round primed with these set a nice little coating of salt in your barrel, which in turn invited every last drop of moisture in the air to come and attack your barrel, right now. Most modern cleaning solvents won't remove this, and the barrels need to be cleaned with a water based solvent (or even just straight water) to dissolve and remove this residue. A good coating of oil was in order after cleaning, which I'm sure you understand. Mercuric primers are another matter, in that they do no real damage to the barrel, but will render the brass useless upon firing. Actually, they even weaked the brass over time even if they weren't fired. The mercury formed an amalgamation with the brass and created all manner of problems. They were also frequently used in conjuntion with the potassium chloride, which made the primer both mercuric and corrosive. I've never heard of anything relating to sealants creating problems with erosion, but hey, always willing to learn something. Like to hear more about this, if anyone has anything to offer. [/QUOTE]
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