I have been pheasant hunting for about 7 years. Up until this past season I always used #5 copper plated lead through modified in a 12ga. I missed or wounded a lot of birds. This past season there were no birds, but I changed to a 20ga and #6 copper plated lead or tungsten out of an improved cylinder choke. I only shot at 8 or 9 pheasant all season, but all except one went down with the first shot. The other took a followup shot. I did not loose a single bird this past season.
Gotta get me some of that tungsten you were shooting last year, did you get it online?