I have a pretty firm rule for this. If I am hunting in my "back yard", within 100 miles of the house or so, I shoot the cheap stuff. That usually means shooting #4 3" Kent Faststeel. Now if I am traveling, that is a different story, I buy the expensive stuff. That usually means bismuth. I am fortunate enough to live at the mouth of the Mississippi river and often hunt 40 or more days during a Duck season so shells can become a serious expense. On the other hand, If I travel to hunt, which I usually so two or three times a year, what is another 20 dollars to insure success. I started doing this after a hunt in South Arkansas a few years ago when the birds wouldn't come within 50 yards. If we wanted to kill, we had to take some long shots. When traveling, I actually carry both types and if the birds work well, I use the standard stuff and keep the premium stuff for the next hunt.