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Old April 27, 2011, 11:40 AM   #10
Brian Pfleuger
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Join Date: June 25, 2008
Location: Central, Southern NY, USA
Posts: 18,343
Yeah, but you're looking at powders with a max of around 22gr, right?

That means a 10% variance in powder lots could result in something like a theoretical 2.2gr variance, ALL ELSE EQUAL. So, if the one company gets the "hottest" batch and comes up with a max of 19.8gr and another company gets the "coldest" batch, they get 22gr.
The 22gr max company would suggest a starting load right around the max load of the other company.

That's with "all else equal", which it isn't. Personally, I'm a little surprised that small capacity handgun data doesn't vary MORE than it does. QuickLoad is a real eye opener. Variances of .005 can effect pressure DRASTICALLY.
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