I voted for the case as I figured no one else wood
Around my house it works this way.
First the case is selected. Usually W-W are picked as they have more powder room.
Then the bullet is selected
Followed by the powder and a primer.
Powder is adjusted until best groups are achieved. If velocity and group size are in the ball park I go to the next step. If not I change powders.
After group size is ball park at the desired velocity lever.
Then the best primer for group improvement selected.
Next is sorting of bullets first by length of bearing surface and weight.
Then COL is adjusted.
As I'm doing all of the above I'm determining drops at distances beyond 800 yds or so.
Now the load is worked up and the drop chart is close enough to hit something out towards 1K.
and finally, after all of that, its time to replace or rechamber the barrel as it's pretty much worn out.
Just kiddin' on the worn out part.