#11
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That is what I do when comparing different load variables, but what foxhunter is talking about is comparing velocity differences (variation/SD) when loaded exactly the same. There has to be an error factor associated with sequence (due to heat), I was just wondering how much of a factor this would be. |
#12
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It should be the same thing. So if you fire a set of cases and then sort them into fast, medium and slow with chronograph data (or maybe just high and low SD), then you would just reload them for a subsequent test and then shoot batches in round-robin to interleave the sequence.
With F-class there is time to take notes and such. I've had a few shots that seemed worse than the conditions should allow, so I would set those cases apart to inspect later. A few high shots were attributed to donuts this way. I also found one with a significant banana shape. One side of the case must have been much thicker, because the FL die would not straighten it out. |
#13
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20 years ago, I set myself up to do load development at the range. I hated loading 5 of this and 5 of that and then coming home to pull the ones that would be way too hot. I'd bring primed brass to the range and load like that.
At the time, I remember doing a test of firing a shot, then decap, neck size, prime, charge, seat and shoot. Did that about 10 shots with the same case. I really really wish I had taken some notes on this experiment to share! With that said, I now have a range outside my home and can redo this experiment....in about 5 months when the snow melts and the air doesn't hurt my face. I can charge the cases with even greater accuracy, I have an FX120i scale with autotrickler/dump. Perhaps 5 cases, fire 5 at individual bulls. Keep the 5 segregated and reload them 5 total times. This will generate five, 5 shot groups with one case used for each group. I can't wait to give this a try. Thanks for the inspiration! |
#14
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#15
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academic, yes. I fire a fowler shot and then wait 5 minutes between shots and use wind flags and look for the exact same conditions. I would think this would minimize the heat factor.
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