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Rifles, Reloading, Optics, Equipment
Reloading
7RUM case denting when firing (pic)
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<blockquote data-quote="Brain" data-source="post: 239085" data-attributes="member: 7343"><p>Thanks for all the input. It's very much appreciated.</p><p></p><p></p><p>In this particular circumstance, yes, the fired case neck diameter was .001 less than loaded round diameter. This is not due to a tight neck chamber, but because the case did not expand. Chamber diameter in the neck area is 0.322 which gives me 0.008 of clearance with a loaded round.</p><p></p><p>Unless I'm hunting, or shooting a match, everything gets shot over a chronograph and recorded. 94gr = 3330, 3322; up to 98gr = 3372, 3379. I believe these to be acceptable velocities for a 26" barrel and in line comparatively with other loads I have used in this rifle.</p><p></p><p>I too think pressure is too low. Before I try a different powder I am going to seat the VLD's deeper into the case for more bearing surface engagement. With the 168 VLD's there is only 0.073 of bearing surface making contact with the neck. The 162 SST's have the entire length of the neck (0.287) contacting the bearing surface. This should allow for more dwell time and resulting pressure increase for the case to expand before the mouth of the case is void. </p><p></p><p>I'll post results when I get them.</p><p></p><p>Thanks again.</p></blockquote><p></p>
[QUOTE="Brain, post: 239085, member: 7343"] Thanks for all the input. It's very much appreciated. In this particular circumstance, yes, the fired case neck diameter was .001 less than loaded round diameter. This is not due to a tight neck chamber, but because the case did not expand. Chamber diameter in the neck area is 0.322 which gives me 0.008 of clearance with a loaded round. Unless I'm hunting, or shooting a match, everything gets shot over a chronograph and recorded. 94gr = 3330, 3322; up to 98gr = 3372, 3379. I believe these to be acceptable velocities for a 26" barrel and in line comparatively with other loads I have used in this rifle. I too think pressure is too low. Before I try a different powder I am going to seat the VLD's deeper into the case for more bearing surface engagement. With the 168 VLD's there is only 0.073 of bearing surface making contact with the neck. The 162 SST's have the entire length of the neck (0.287) contacting the bearing surface. This should allow for more dwell time and resulting pressure increase for the case to expand before the mouth of the case is void. I'll post results when I get them. Thanks again. [/QUOTE]
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Reloading
7RUM case denting when firing (pic)
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