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.