I use a Lee turret and Hornady makes a short very bright LED light strip that sticks to the press and lets you see inside the case. It's pretty cheap and works good. I put some electrical tape on the edge that faces me to shade me from glare. With a .38 and a light load of W231 I use a dental mirror to see down in the case, but everything else I load it's easy to check each one before the bullet is seated.