Factory ammo does vary quite a bit even lot to lot. 5 or 6 years ago I recall being surprised by some Sako 308 ammo, ES was over 100fps within the same box.
In the weekend I tested some 22 match ammo, within the same packet 3 different rifles ES was 22, 19 and 16 fps. SDs in the 5.7 to 7.2 range. That's fantastic 22 ammo!
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