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We had a saying in engineering; "you don't know for sure, if you don't measure".
It is actually a good axiom for almost any domain.
If you really want to know how/what your ammunition is doing in your guns, don't go by what others have reported (especially ammo manufacturers), go by what is actually happening, and one aspect of that to measure the velocity (the other is a gel test for the projectile, but that is expensive and there are youtubers out there that are specializing in that - with the exception of some specialty ammo/projectiles, and even there some people are targeting that domain).
It is actually a good axiom for almost any domain.
If you really want to know how/what your ammunition is doing in your guns, don't go by what others have reported (especially ammo manufacturers), go by what is actually happening, and one aspect of that to measure the velocity (the other is a gel test for the projectile, but that is expensive and there are youtubers out there that are specializing in that - with the exception of some specialty ammo/projectiles, and even there some people are targeting that domain).