Yep. Load straight ammo. Like shot placement is to killing power, straight ammo is to accuracy.
I sort cases by neck concentricity or variance of neck wall thickness. Neck size with a good bushing die or the Lee collet die. Use a good seater die that seats bullets straightly. That will get you most of the way there. You can certainly try different bullets and powders, definitely try different powder charges and seating depths and even different primers as those can all make noticeable and sometimes significant differences, but straight ammo is the foundation of it all. It's amazing how many different combinations work when the ammunition is straight.
Now how much your rifle can utilize your super straight and super accurate ammo is a story for a different thread...
Also, since we're educating the kids, brush and floss your teeth, get a good education, and stop that before you go blind.
