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Is there an official standard set by SAMMI,,,
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SAAMI lists the std @ 1135 fps and the HV @ 1235 fps. for a 40 grain bullet.
How they arrive at those figures has my head still spinning.
They mention a lot of terms - like Maximum Probable Lot Mean and Maximum Probable Sample Mean & give math formulas that, to me. read like something in an alien language.
You can go here:
http://www.saami.org/specifications_...tion/index.cfm
And download a pdf for the rimfire.
I mistakenly thought you had to pay to download it, but, you don't.