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I have been testing Grand Slams (3" #5s) and several other lead loads, through several chokes over the last few weekends, and have found that nothing can top Winchester Long Beard XR but the Federal Premium Turkey and the Federal Grand Slam do a respectable job, just not quite as good of a job, at least in my gun. Out to 40 yards, Grand Slam will do the job from what the pattern board is telling me though.
I am the op and am well aware of the limitations of lead. Don't need a pompous response. Just asked an honest question because I have not shot these loads yet. A lot of good people on this site have positive responses to honest questions without reminding ops in a negative way.