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Rifles, Reloading, Optics, Equipment
Reloading
Struggling with Seating Depth Precision - 300 PRC - Monometals
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<blockquote data-quote="btuley" data-source="post: 2977358" data-attributes="member: 125939"><p>Thanks everyone. </p><p></p><p>I took out the 35 rounds of Barnes 208 with 74 grains of H4831SC that I had prepped for the Elk that didn't who his face this fall. I measured the CBTO and grouped them into 4 groups based on length. They were around 0.01 jump so I had room to set them all back towards 0.02. I used four different settings on my seating die with the assumption that the original group differences were driven by bullet variations from where the seater stem presses to the ogive.</p><p></p><p>The result is that for this group my extreme spread decreased from 0.0075 to 0.0035. Still not quite what I would hope, but significant evidence that much of my error is driven by the bullet variation.</p><p></p><p>I plan to get out to a range I can shoot from prone and test these for groups.</p><p></p><p>Thanks to this conversation I feel good about keeping the stock jaws on the Forster press. I may still need to work with a different seater die. I think I'll also use the expander ball as I size the rest of my unfired brass.</p><p></p><p>I've got some 176 grain A-tip and just receives some different powders, H1000 and Retumbo, to try some different combinations for better groups, but as I work through those combinations I want to be nailing my seating depth. We'll see if the A-Tips seat more consistently, fingers crossed</p></blockquote><p></p>
[QUOTE="btuley, post: 2977358, member: 125939"] Thanks everyone. I took out the 35 rounds of Barnes 208 with 74 grains of H4831SC that I had prepped for the Elk that didn't who his face this fall. I measured the CBTO and grouped them into 4 groups based on length. They were around 0.01 jump so I had room to set them all back towards 0.02. I used four different settings on my seating die with the assumption that the original group differences were driven by bullet variations from where the seater stem presses to the ogive. The result is that for this group my extreme spread decreased from 0.0075 to 0.0035. Still not quite what I would hope, but significant evidence that much of my error is driven by the bullet variation. I plan to get out to a range I can shoot from prone and test these for groups. Thanks to this conversation I feel good about keeping the stock jaws on the Forster press. I may still need to work with a different seater die. I think I'll also use the expander ball as I size the rest of my unfired brass. I've got some 176 grain A-tip and just receives some different powders, H1000 and Retumbo, to try some different combinations for better groups, but as I work through those combinations I want to be nailing my seating depth. We'll see if the A-Tips seat more consistently, fingers crossed [/QUOTE]
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Struggling with Seating Depth Precision - 300 PRC - Monometals
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