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Being described as a coyote choke good to 70 yards would seem to indicate a really tight constriction; therefore the warning against steel. Steel is better in a choke typically no tighter than Modified.
One thing, porting on a choke is a waste of money as it does nothing for performance; extended chokes are nice because they can be easily changed or identified.
As to more expensive chokes not being worth more - that would depend. There are chokes made from titanium, aluminum/ceramics, and other new materials that make them lighter, easier to clean, etc. Whether they alter your performance enough to matter is something only you can decide
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