Or you could use some like the Hornady Lock-N-Load Headspace Gage
link and try measuring the rounds that will chamber and properly adjust your die so they all will fit. For a bolt action, setting the shoulder back 0.001 to 0.003" is the goal.
It is interesting that everyone measures brass length and adjusts their trimmer so it trims to the correct length. But is willing to just "give the die another 1/4 turn" which could set the shoulder back as much as 0.020" and result in excessive headspace.