There are the non lead bullets that use compressed,powdered material other than lead. Then there are the Barnes TSX/TTSX and the Hornady GMX guilding material non lead bullets.
To me,the Barnes and Hornady are too expensive to be used for varmints. They would also not expand adaquately for the "red mist" thing.
Would suggest that you find a bullet of the frangeable type and drive it as fast as accurate,out of a fast twist bbl. --- SAWMAN