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Rifles, Reloading, Optics, Equipment
Reloading
Standard Deviation
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<blockquote data-quote="QuietTexan" data-source="post: 2639737" data-attributes="member: 116181"><p>Direct answer to the question - it shouldn't matter. Barrel temp and chamber temp shouldn't have such an impact on a load that it changes anything. </p><p></p><p>If your cold bore shots are going to be in an extreme conditions you should verify your POA/POI in those conditions. But the load itself shouldn't be affected unless the temp is on the too hot side of the spectrum, 90* or over.</p><p></p><p></p><p>In this case tuning means finding a wide enough powder node that differences in POI from shot-to-shot velocity are minimized. There are several ways to get there, but getting shots to waterline consistently at under 1000 yards isn't terribly difficult, and SD/ES can be pretty awful on paper but still print good targets. </p><p></p><p>There are different solution sets to meet differing ultimate end goals - smallest possible group, widest possible nodes, furthest possible minimum velocity. Defining what you need a load to do determines what all you need to do. I've hunted with God-awful 100+FPS ES on loads before because the rifle printed bugholes at 100 yards, and guess how far the feeder was? Flip side I was pulling my hair out over a 10/30 SD/ES load because my rounds were impacting +/-10" at 500 yards. FPS was phenomenal, stats were nice and tight over 60 rounds, but there was zero precision at all in the load, mainly because it was a volatile powder and it was 104* outside. The tightness of the velocity range was probably because I was so overpressure that I should have been scared <img class="smilie smilie--emoji" loading="lazy" alt="🤣" title="Rolling on the floor laughing :rofl:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f923.png" data-shortname=":rofl:" /> </p><p></p><p>Decent components shot through a decent barrel should net you 1MOA groups out to 600 yards their own, shrinking that MOA down is where the work is. (224s/smaller and sub 90gn bullets excepted due to lateral drift).</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2639737, member: 116181"] Direct answer to the question - it shouldn't matter. Barrel temp and chamber temp shouldn't have such an impact on a load that it changes anything. If your cold bore shots are going to be in an extreme conditions you should verify your POA/POI in those conditions. But the load itself shouldn't be affected unless the temp is on the too hot side of the spectrum, 90* or over. In this case tuning means finding a wide enough powder node that differences in POI from shot-to-shot velocity are minimized. There are several ways to get there, but getting shots to waterline consistently at under 1000 yards isn't terribly difficult, and SD/ES can be pretty awful on paper but still print good targets. There are different solution sets to meet differing ultimate end goals - smallest possible group, widest possible nodes, furthest possible minimum velocity. Defining what you need a load to do determines what all you need to do. I've hunted with God-awful 100+FPS ES on loads before because the rifle printed bugholes at 100 yards, and guess how far the feeder was? Flip side I was pulling my hair out over a 10/30 SD/ES load because my rounds were impacting +/-10" at 500 yards. FPS was phenomenal, stats were nice and tight over 60 rounds, but there was zero precision at all in the load, mainly because it was a volatile powder and it was 104* outside. The tightness of the velocity range was probably because I was so overpressure that I should have been scared 🤣 Decent components shot through a decent barrel should net you 1MOA groups out to 600 yards their own, shrinking that MOA down is where the work is. (224s/smaller and sub 90gn bullets excepted due to lateral drift). [/QUOTE]
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