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Rifles, Reloading, Optics, Equipment
Reloading
OCW Test help
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<blockquote data-quote="JTH" data-source="post: 2592729" data-attributes="member: 59647"><p>I've been working on a load for my 300 PRC with the Badlands 195 grain and settled on 80.7 grains of N570. Seated at 3.602 it's been pretty consistent, and ES always relatively low (less than 25, today the 3 shot average ES was 14.6). For reference, here's a group at 300 yards :</p><p></p><p>[ATTACH=full]385078[/ATTACH]</p><p>Last week I took it out to 600 yards. Conditions weren't perfect, wind 8-16mph, a little gusty and quartering from different angles. Printed a group that was 4.5" or so, but it was fairly vertical. The vertical got me thinking maybe I should do an Optimal Charge Weight test. Loaded some up this morning, and here's what it looked like at 100 yards: (ignore the ant on the target to the right of 81.1)</p><p></p><p></p><p>[ATTACH=full]385080[/ATTACH]</p><p>For those who have experience with the OCW method, would you do more testing in the 81.1 to 81.3 range, or does the ES (data from LabRadar) rule that out? It was very humid this morning and 76 degrees, I've had N570 get a little inconsistent when temps get near 80 degrees, so the ES could be temp related.</p></blockquote><p></p>
[QUOTE="JTH, post: 2592729, member: 59647"] I’ve been working on a load for my 300 PRC with the Badlands 195 grain and settled on 80.7 grains of N570. Seated at 3.602 it’s been pretty consistent, and ES always relatively low (less than 25, today the 3 shot average ES was 14.6). For reference, here’s a group at 300 yards : [ATTACH type="full" alt="1E45D967-E8F6-4377-A265-1F1567D9DD1F.jpeg"]385078[/ATTACH] Last week I took it out to 600 yards. Conditions weren’t perfect, wind 8-16mph, a little gusty and quartering from different angles. Printed a group that was 4.5” or so, but it was fairly vertical. The vertical got me thinking maybe I should do an Optimal Charge Weight test. Loaded some up this morning, and here’s what it looked like at 100 yards: (ignore the ant on the target to the right of 81.1) [ATTACH type="full" alt="1986BF67-FECC-4B90-B431-02644099913F.jpeg"]385080[/ATTACH] For those who have experience with the OCW method, would you do more testing in the 81.1 to 81.3 range, or does the ES (data from LabRadar) rule that out? It was very humid this morning and 76 degrees, I’ve had N570 get a little inconsistent when temps get near 80 degrees, so the ES could be temp related. [/QUOTE]
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