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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
SHERMAN LONG ACTION SHOOTERS
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<blockquote data-quote="CA48" data-source="post: 1347487" data-attributes="member: 21446"><p>I have been curious about n570 and throat life as well now because I was thinking of switching back to it in my 6.5SS. Shawn may be experiencing this because he is running right around 100 grs of powder and a stepped throat will erode faster in general. N570 is a high energy double based powder. From my understanding they add nitroglycerol to double based powders to create a higher flame temperature which creates more velocity without increasing pressures excessively. So running over 100 grs in a 338 lap imp with a stepped throat I can see why the throats went so quick. I remember a forum member on here some time ago, from Norway I think. He was running n570 in his 338 lap with 300 gr scenars and had about 4000 rounds on his barrel and was still grouping less than half moa. So maybe n570 only accelerates throat erosion to the extremes when ran in overbore cartridges?</p></blockquote><p></p>
[QUOTE="CA48, post: 1347487, member: 21446"] I have been curious about n570 and throat life as well now because I was thinking of switching back to it in my 6.5SS. Shawn may be experiencing this because he is running right around 100 grs of powder and a stepped throat will erode faster in general. N570 is a high energy double based powder. From my understanding they add nitroglycerol to double based powders to create a higher flame temperature which creates more velocity without increasing pressures excessively. So running over 100 grs in a 338 lap imp with a stepped throat I can see why the throats went so quick. I remember a forum member on here some time ago, from Norway I think. He was running n570 in his 338 lap with 300 gr scenars and had about 4000 rounds on his barrel and was still grouping less than half moa. So maybe n570 only accelerates throat erosion to the extremes when ran in overbore cartridges? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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SHERMAN LONG ACTION SHOOTERS
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