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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
High Velocity Throat Erosion
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<blockquote data-quote="tacomHQ" data-source="post: 2586813" data-attributes="member: 67159"><p>A very interesting thread. </p><p>As a note: we have a .416 barrel that had not been cleaned on a regular basis. In fact it was so "dirty" that for 12+" the lands were fully filled and the only way you could detect them was the corrosion event. Upon cleaning the barrel- a few days and 80patches- the bore showed fire cracking for 18" plus. This barrel had 500 rounds in it. IF the grooves are packed/dirty/filled - just what are we engraving? Or are we sending a "button" down the barrel? Something has to give and the "friction heat" probably approaches a welding event. </p><p>Our 260Rem has light fire cracking for about 1" with 1500 rounds through it - a gas gun. </p><p>Inversely we have a .460barrel with the same round count- immaculately taken care of- and the fire cracking is only a few inches in length. </p><p>Our 260Rem has light fire cracking for about 1" with 1500 rounds through it - a gas gun. </p><p>We have some barrels in which the "fire cracking" appears to have lifted off leaving a "oatmeal" like structure behind. I have seen this phenomena in another field of work and could be replicated quite easily - MEMS, super smooth finishes (Single digit Angstrom level). We could reproduce this "finish" up into the single digit micron values. Testing to see if the fire cracking lifted or it is bad material is another problem, but it sure is not helping things concerning the "accuracy" formula. </p><p>We are running a series test of materials attempting to directly replicate the fire cracking and isolate the individual variables. To the point of material- 416 is not a heat resistant material. It should also be noted, that outside of powdered metals, you can have large differences in a single bar of material resulting in a barrel being different than the immediate barrel following on the same stick. "Large" being how big of a "microscope" do you view the parameters with. We are testing materials with 3x the heat resistance- however like all engineering attempts "compromise" is the gorilla in the room. </p><p>The large gain twist- in our opinion works.... and works very well.</p></blockquote><p></p>
[QUOTE="tacomHQ, post: 2586813, member: 67159"] A very interesting thread. As a note: we have a .416 barrel that had not been cleaned on a regular basis. In fact it was so "dirty" that for 12+" the lands were fully filled and the only way you could detect them was the corrosion event. Upon cleaning the barrel- a few days and 80patches- the bore showed fire cracking for 18" plus. This barrel had 500 rounds in it. IF the grooves are packed/dirty/filled - just what are we engraving? Or are we sending a "button" down the barrel? Something has to give and the "friction heat" probably approaches a welding event. Our 260Rem has light fire cracking for about 1" with 1500 rounds through it - a gas gun. Inversely we have a .460barrel with the same round count- immaculately taken care of- and the fire cracking is only a few inches in length. Our 260Rem has light fire cracking for about 1" with 1500 rounds through it - a gas gun. We have some barrels in which the "fire cracking" appears to have lifted off leaving a "oatmeal" like structure behind. I have seen this phenomena in another field of work and could be replicated quite easily - MEMS, super smooth finishes (Single digit Angstrom level). We could reproduce this "finish" up into the single digit micron values. Testing to see if the fire cracking lifted or it is bad material is another problem, but it sure is not helping things concerning the "accuracy" formula. We are running a series test of materials attempting to directly replicate the fire cracking and isolate the individual variables. To the point of material- 416 is not a heat resistant material. It should also be noted, that outside of powdered metals, you can have large differences in a single bar of material resulting in a barrel being different than the immediate barrel following on the same stick. "Large" being how big of a "microscope" do you view the parameters with. We are testing materials with 3x the heat resistance- however like all engineering attempts "compromise" is the gorilla in the room. The large gain twist- in our opinion works.... and works very well. [/QUOTE]
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