Satterlee 10 Round Load Development

[Klem]

I have done a 'What if' at 1K yards using JBM's online ballistics calculator. It's not real like the 100yd test but it is consistent if you believe the MOA drops it spits out.

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In the scenario I have given the Satterlee load (the best SD/Spread) the best chance of winning by assuming the following;

1. That the slowest round is at the bottom of the group, the 6 O'clock position.
   
2. That the fastest round is at the top of the group, the 12 O'Clock position.
   
3. That the actual Best Group at 100yds was a statistical anomaly (unusually tight) and have made it the size of the next best group 0.329MOA@100yds.
   

Assuming a cone of fire will never diminish as range increases I have multiplied the 100yd group sizes by 10 to simulate 1,000yds. Then added the max possible vertical bias that differences in bullet velocity would blow the group out by. This is the difference between fastest bullet at 12'Oclock and slowest bullet at 6'clock.

Even with biasing Satterlee with the best possible conditions and replacing that great group at 100 with the next best group, the Best Group still wins the day.

Sure, different velocities will expand the group at 1K with a vertical bias but looking for the lowest Standard Deviations/velocity spreads is not the best predictor of 1K group size when you have actual 100yd group sizes to inform your decision. If you accept JBM's drop predictions, and assume both groups and velocity spreads are repeatable we can now say with certainty that Satterlee does not work in all situations. Unfortunately, you will never know when Satterlee is correct unless you shoot all loads at 1K, which of course renders Satterlee moot as a predictor.

And the idea you can do all this with only 10rds across chrono is as useful as an ashtray on a motor bike.