Every ammo maker has it's "Standards" on what the fps should be for a certain load.

I once bought a 22 sub-sonic that went across my chrony at 1105 fps !!

Bigger bullets are a LOT EASIER to control in the fps data.

Must I also mention the old.... ever weapon is different ? La La La.

The 147gr bullet can have a .60 to .67" over all length that can
also mess up the fps figures with a slow or fast powder loading
if set at 1.08" or a whopping 1.169" OAL.

Good luck.