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Old December 4, 2012, 12:49 PM   #12
Senior Member
Join Date: October 9, 1998
Location: Ohio USA
Posts: 7,884
Is there an official standard set by SAMMI,,,
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:

And download a pdf for the rimfire.

I mistakenly thought you had to pay to download it, but, you don't.
Hal is offline  
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