I thought I might try them with some of the new "green" lead-free primers for use in indoor ranges. One range I shoot at has good ventilation so it's not a problem. The other one has poor ventilation. Instead of using the lead-free components I now wear a filter mask to shoot indoors. Not a comfort mask or a dust mask, but one with cannister filters. This works great and I do it because I've been shooting indoors a lot this winter. Filter masks like this are worthwhile for anyone who works with paints, chemicals, or insulations around the home. They cost about $30 and fit great, and they last a long time. They do not interfere with shooting.