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Rifles, Reloading, Optics, Equipment
Reloading
OCW opinions...?????
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<blockquote data-quote="User4302021" data-source="post: 1616069" data-attributes="member: 105322"><p>I printed out your target picture and did some target analysis.</p><p></p><p>First, Hodgdon's pressure data lists 47 grains as max. But they use Winchester brass. Your max based on the same pressures in Lapua brass is going to be somewhere around 46 grains. I know this may not be the same for your rifle, but it is a starting point.</p><p></p><p>I have consistently found that loads that are in the vicinity of 2% off maximum are the most consistent and tunable. I don't know your rifle, so there will be some variability. This is where we start looking at the target.</p><p></p><p>I printed out your target and drew straight lines between each group center. Then I drew a line from POA to each group center. What I see is that 45.3, 45.5, 45.7 all have virtually the same height. However, 45.5 and 45.7 also have identical angle from POA.</p><p></p><p>2% off from 46 grains is 45.1 grains.</p><p></p><p>So...</p><p>A) 45.5 is safe in your rifle</p><p>B) It is right in the immediate area I would expect a node to show up.</p><p>C) It is in the middle of 3 loads with the same vertical. (At the highest vertical to boot)</p><p>D) It "clocks" identically from POA with the load above it, so POI will most likely stay stable when it gets hot.</p><p>E) It is only 0.2 grains from a known performing load.</p><p></p><p>Given the targets you presented, 45.5 grains is where I would start seating depth testing if it were me.</p></blockquote><p></p>
[QUOTE="User4302021, post: 1616069, member: 105322"] I printed out your target picture and did some target analysis. First, Hodgdon's pressure data lists 47 grains as max. But they use Winchester brass. Your max based on the same pressures in Lapua brass is going to be somewhere around 46 grains. I know this may not be the same for your rifle, but it is a starting point. I have consistently found that loads that are in the vicinity of 2% off maximum are the most consistent and tunable. I don't know your rifle, so there will be some variability. This is where we start looking at the target. I printed out your target and drew straight lines between each group center. Then I drew a line from POA to each group center. What I see is that 45.3, 45.5, 45.7 all have virtually the same height. However, 45.5 and 45.7 also have identical angle from POA. 2% off from 46 grains is 45.1 grains. So... A) 45.5 is safe in your rifle B) It is right in the immediate area I would expect a node to show up. C) It is in the middle of 3 loads with the same vertical. (At the highest vertical to boot) D) It "clocks" identically from POA with the load above it, so POI will most likely stay stable when it gets hot. E) It is only 0.2 grains from a known performing load. Given the targets you presented, 45.5 grains is where I would start seating depth testing if it were me. [/QUOTE]
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OCW opinions...?????
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