Neck Tension, Jump, Touch or Jam and every combination of powder, primer and brass can effect pressure and other areas and they may be different for different barrels, twists, number of groves etc. You could spend you entire life (and burn out a lot of barrels) trying to find THEE perfect combination, but then you have to be able to actually shoot it well enough so that you are not causing the variation and be in the right conditions.
Fortunately I have access to an indoor range, that is fine for center fire up to 100 yards. On days that it is closed, the fans can be left off and some of the variations eliminated, like wind.
What is interesting is that shooting 1,000 yard, I weight each charge, while many 100 yard benchrest shooters, not only load / tune on the bench, but use a powder measure to throw the powder charges.
After three times at the Williamsport 1000 Yard Bench Rest School, I have replaced most ladder testing with just looking for reduction in velocity variations, which for sure will effect vertical spread.
Bob
Fortunately I have access to an indoor range, that is fine for center fire up to 100 yards. On days that it is closed, the fans can be left off and some of the variations eliminated, like wind.
What is interesting is that shooting 1,000 yard, I weight each charge, while many 100 yard benchrest shooters, not only load / tune on the bench, but use a powder measure to throw the powder charges.
After three times at the Williamsport 1000 Yard Bench Rest School, I have replaced most ladder testing with just looking for reduction in velocity variations, which for sure will effect vertical spread.
Bob
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