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I too went the regression route and came up with the same thing. Even just using the XY Scatter chart you can come up with the least squares formula. I don't really know for sure though what the author means that his half looking bell curve is an application of the least squares method. This is basically statistical sampling so we really don't know the true value but can only come close because there is yet to be a universe created. How close? The author doesn't state. I have tested his method and it works as far as initial zero loads for an unfamiliar rifle. I've tested on two different rifles (.300 H&H Ruger and a custom bolt action .300 H&H). In each case I was able to determine the nearest safe max load as well as accuracy load once you create a scatter chart. The rest was up to the range work and didn't have to make any load changes after verification. Too bad he never followed up on his article on how the chronograph can help estimate pressure as well.
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