When I used to shoot steel, I used 3's. I was shooting over dekes and I guess it performed as well as it could. I tried the 2's, 3's and 4', and 3's seemed to be the best compromise with steel over decoys.
I jumped all over bismuth when it came out. In '03, Natchez had a big sale on Kent Tungsten/Polymer and I bought a bunch of it. I still have half a 20mm ammo can of the stuff.
Sorry, to not answer the OP directly, but I did the same as Hawk. Tungsten Polymer from Kent is just about the equal of lead in density and makes steel look like confetti in comparison. Ok, a little hyperbole there but it's just so much better and yet softer than lead and much more so than steel.
