If your getting the accuracy your after don't worry about the speed , if you get the speed you might lose the sub 1 moa , on my creedmoor I've only checked the speed once I got the accuracy just for dialling the scope

If you factor in differing ambient conditions such as temperature, barometer, altitude, etc. and then add type of brass and primer used, not to mention different chronys and rifle chambers, one could easily find a difference of 120fps, if everything else about the loads and rifles were identical, which they probably are not.

Not going to make much difference in performance unless you are planning to shoot beyond 600 meters/yards.

Another anecdote with a different .30-06 and different components.  Bullet is Hornady 150 GMX, powder is IMR4064, brass is Remington once-fired, primers are CCI Large Rifle. Hornady tests with essentially the same rifle as mine but they use Hornady or Frontier cases and Winchester Large rifle primers.

Hornady says you can load to 55.6 grains and expect 3,000 FPS.  I got 3,000 FPS with 52 grains.  At 55 grains, which their load data says is acceptable in THEIR tests, my primers were flattened and cratered.  In fact, I finally settled on 52 grains and still get a bit of flattening and cratering.

Even with monolithic (copper) bullets, which have to go fast in order to open, I'll take accuracy over speed any day.  I stick to shots less than about 200 yards, so even a 200-300 FPS MV loss is acceptable so long as the load is accurate.