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Rifles, Reloading, Optics, Equipment
Reloading
New Reloading Method for me
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<blockquote data-quote="User4302021" data-source="post: 1909361" data-attributes="member: 105322"><p>This is my MUCH abbreviated process based on years of trying all the methods (OCW, Audette ladder, various chrono methods...etc)</p><p></p><p>Find max charge by looking at velocity, base expansion...etc. The rifle system you are using may be more or less efficient than the pressure barrel used at the lab, but all else being equal, pressure = velocity. Adjust your target velocity for barrel length.</p><p></p><p>Once found, back off from that max and run 4 loads...max-2.5%, max-2%, max-1.5%, max-1%.</p><p></p><p>Ex: If 45grains was determined to be max...you would test 43.8gr, 44.1gr, 44.3gr, 44.5gr.</p><p></p><p>One of these should be satisfactory. If you run higher than this, then you run the risk of being in over max pressure territory if shooting in higher temps. You may find an accurate load below this, it will just be slow.</p><p></p><p>I look for the load striking with the highest POI at 200 yards (5 round groups at least). Ideally, I want the barrel to be at the top of it's travel, rather than at the bottom (look up "positive compensation"). So far, this has proven fairly easy to discern.</p><p></p><p>There is often a really tight shooting seating depth around 0.010"-0.020" off the lands...but it can be finicky in the same way running high pressure often is.</p><p></p><p>I prefer to start at 0.040" off the lands and test back from there. It is my experience that bullets, with a little room to run, engrave into the lands much more consistently without the weird, finicky pressure spiking. Of course, all bullets have thier own characteristics.</p><p></p><p>In the past I've used 0.005" increments, but I've recently decided to use 0.010" increments to cover more ground quickly.</p><p></p><p>If I can't find a good shooting seating depth at 0.040", 0.050", or 0.060" off the lands, then I abandon this combination and start over.</p><p></p><p>As an example, I just developed a load with 155 grain SMK's in a 16" suppressed 308. I used LC brass, and IMR4895. This load wasn't anything special at 100 yards. It held under 1.25moa at 100 yards for 10 rounds (groups were round with no stringing).</p><p></p><p>However, it held that same <1.25moa dispersion at 910 yards! I think I'll keep it.</p></blockquote><p></p>
[QUOTE="User4302021, post: 1909361, member: 105322"] This is my MUCH abbreviated process based on years of trying all the methods (OCW, Audette ladder, various chrono methods...etc) Find max charge by looking at velocity, base expansion...etc. The rifle system you are using may be more or less efficient than the pressure barrel used at the lab, but all else being equal, pressure = velocity. Adjust your target velocity for barrel length. Once found, back off from that max and run 4 loads...max-2.5%, max-2%, max-1.5%, max-1%. Ex: If 45grains was determined to be max...you would test 43.8gr, 44.1gr, 44.3gr, 44.5gr. One of these should be satisfactory. If you run higher than this, then you run the risk of being in over max pressure territory if shooting in higher temps. You may find an accurate load below this, it will just be slow. I look for the load striking with the highest POI at 200 yards (5 round groups at least). Ideally, I want the barrel to be at the top of it's travel, rather than at the bottom (look up "positive compensation"). So far, this has proven fairly easy to discern. There is often a really tight shooting seating depth around 0.010"-0.020" off the lands...but it can be finicky in the same way running high pressure often is. I prefer to start at 0.040" off the lands and test back from there. It is my experience that bullets, with a little room to run, engrave into the lands much more consistently without the weird, finicky pressure spiking. Of course, all bullets have thier own characteristics. In the past I've used 0.005" increments, but I've recently decided to use 0.010" increments to cover more ground quickly. If I can't find a good shooting seating depth at 0.040", 0.050", or 0.060" off the lands, then I abandon this combination and start over. As an example, I just developed a load with 155 grain SMK's in a 16" suppressed 308. I used LC brass, and IMR4895. This load wasn't anything special at 100 yards. It held under 1.25moa at 100 yards for 10 rounds (groups were round with no stringing). However, it held that same <1.25moa dispersion at 910 yards! I think I'll keep it. [/QUOTE]
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Reloading
New Reloading Method for me
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