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More along the lines of 0.1% for LabRaderwhen compared to unnecessarily high-end doppler radars.
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Glad to hear you say about the small ES doesn't equate to small groups, I have witnessed when load development on a 7mm Rem Mag, the best group with all three touching had an ES of 50 and the one with the lowest ES of 5 had a group just under 1" at 100yds, I never got to test it out to 500 yards, it was my Grandsons Grad present. I have noticed that with other rifles when developing loads, I had been lead to believe small ES and SD will be small groups, but I have noticed large ES has better grouping at times.
I don't understand how exterior case grip to chamber wall can have any significant effect on internal case pressure. You might get the appearance of differing pressures when looking at the case head, if the case exterior is lubricated, versus grippy. But the internal pressure should be virtually the same between identical loads, no matter the coefficient of friction between the chamber wall and the cartridge case.
Its common to pre load for LR matches. But at my local range Deep Creek, most of us do load at the match. We dont have time to load between targets like short range but we do load for the next day.
Like most guys I started out tumbling my cases because it was common practice. The SS pins came along and I tried it immediately. It beat up my case mouths and effected bullet seating as well as removed the carbon in the necks which I liked so I went back to tumbling. Im sure at some point I just got crunched for time and skipped the tumbling process. I saw zero negatives from that and I have not tumbled a case in over 10 years. Im not saying they shoot better or hold more pressure but they dont shoot worse or hold less pressure and it saves me a lot of work. Its rare to see shiny clean brass at a BR match, so I assume most guys came to the same conclusion. I do know of very good competitors that clean the cases to bare metal, anneal and lube their necks to replace the carbon. Some of them shoot really well, but not any better than the guys that dont do any of that. I dont really enjoy hours or brass work so I only do what shows up on target. I dont clean my hunting brass either. If I was practicing in mud or shooting prs were my cases actually got grit on them Id tumble for a couple minutes to knock it off but not long enough to make them shiny.
This is money, and the reason I pay much more attention to the target than the chrono. I test mainly at 600 yds but still see the same correlation with overlapping POI when I have it right. Have you noticed any advantage to choosing a load that shows a particular group shape?
When you say you went back to tumbling but no SS pins. Do you mean you just used water, dish soap and some lemon shine for example? Please explain
You'd be amazed at just how clean your brass will get just soaking it for a few days in a mix of purple power, Dawn Dish soap, and water thence simply rinsing it well without any tumbling at all.
