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Velocity variations
Some interesting observations via chrono today with a 303. reduced loads.. Cold barrel...10 rounds..copper plated bullet. First shot was 200fps less than the next 9 shots, which were all very similar in fps.
With lead bullet, cold barrel, first shot was 150fps faster than the next 9 shots! If shooting comps, always put first shot into sand!
amc577
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I always finish the cleaning of my barrels (for cast boolits) by applying Fastex oil - this removes the drag on the boolit on the first firing.
Westlander sold this product at one time. I first used it in my pistol days to get the velocity of my boolits up for practical pistol shooting.
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