I do the exact same thing to my brass each reload so I know that wouldn’t be a factor , I trim , shoulder bump, clean and anneal each time. The load stays at a low ES and SD but it started at 2970 FPS and 3 times reloaded it’s now at 3025. I don’t understand why.
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To see this working, head to your live site.
Same load is getting higher and higher in velocity each time the brass is reloaded.
Same load is getting higher and higher in velocity each time the brass is reloaded.
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Temperature spikes due to weather. It’s not uncommon. Even a couple of degrees difference can make an impact.