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Hammer bullets barrel life
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<blockquote data-quote="Bob Wright" data-source="post: 2632664" data-attributes="member: 104363"><p>Interesting question from the OP.</p><p>So here is what I noticed on 3 rifles:</p><p>7RM, Premium barrel, ~350 rounds of cup and core, H4831SC, Retumbo</p><p>Heat checking 1/2 of bore.</p><p></p><p>280AI, Premium barrel, ~350 rounds of copper monos</p><p>RE23 only</p><p>Heat checking 1/2 of bore</p><p></p><p>30-06, Factory Remington SS barrel ~750 rounds</p><p>Cup and core and copper monos</p><p>Varget only</p><p>No heat checking</p><p> </p><p>Since the 280AI and 30-06 share the same case the primary difference is powder selection, as both will have 416 ss barrels</p><p>The variety of some shoot copper or cup and core, so the barrel condition seems to be influenced more by slower burning and higher velocity powders.</p><p>The way copper mono's have drive bands or grooves is reducing the area of the bullet bearing surface contact and engraving pressure from mono to mono. I don't see significant primer flattening when switching from cup and core to monos, speeds are easily attained using same powders or ones with same burn speed.</p><p>Admittedly, these are observations over years of reworking loads. Not scientific testing....</p><p>I don't see anything that says copper monos drive wear, but I do see a correlation to powder burn rates and higher velocities showing heat checking.</p><p>None of the 3 rifles show excessive throat erosion. All of my loads are off the max pressures to the next lower node before I had heavy bolt or flattening primers in ladder tests.</p><p>Just an observation...</p></blockquote><p></p>
[QUOTE="Bob Wright, post: 2632664, member: 104363"] Interesting question from the OP. So here is what I noticed on 3 rifles: 7RM, Premium barrel, ~350 rounds of cup and core, H4831SC, Retumbo Heat checking 1/2 of bore. 280AI, Premium barrel, ~350 rounds of copper monos RE23 only Heat checking 1/2 of bore 30-06, Factory Remington SS barrel ~750 rounds Cup and core and copper monos Varget only No heat checking Since the 280AI and 30-06 share the same case the primary difference is powder selection, as both will have 416 ss barrels The variety of some shoot copper or cup and core, so the barrel condition seems to be influenced more by slower burning and higher velocity powders. The way copper mono's have drive bands or grooves is reducing the area of the bullet bearing surface contact and engraving pressure from mono to mono. I don't see significant primer flattening when switching from cup and core to monos, speeds are easily attained using same powders or ones with same burn speed. Admittedly, these are observations over years of reworking loads. Not scientific testing.... I don't see anything that says copper monos drive wear, but I do see a correlation to powder burn rates and higher velocities showing heat checking. None of the 3 rifles show excessive throat erosion. All of my loads are off the max pressures to the next lower node before I had heavy bolt or flattening primers in ladder tests. Just an observation... [/QUOTE]
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