I am fairly certain that cast iron was one of the media tested years ago when steel first came in .
For whatever reason, low carbon steel is the choice and I doubt very much that it can be improved upon fir modern guns.
I don't shoot it in my vintage guns but I use it in my my modern waterfowl guns .
Cat
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Anytime I figure I've got this long range thing figured out, I just strap into the sling and irons and remind myself that I don't! 
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