One other thing to note; muzzle velocity from a given load in your barrel.
If the load was developed in a SAAMI spec test barrel and fired from a universal receiver fixed in position as SAAMI does, the velocity your get with the same load will probably be lower if you hold the rifle to your shoulder when its shot. I've seen as much as 60 fps average velocity difference between two people shooting the same rifle and ammo that way; we all hold rifles to our bodies differently And a fixed test barrel that doesn't move back in recoil will have higher velocites for a given load than when fired by us humans.
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