The driving factor in the cases going a differnt distance is probably more related to the fact that the steel is probably a hair lighter than the brass.
Steel cases also do not expand as uniformly in the chamber as brass,and therefore do not have as much friction in theory.Thus the amount of fouling that is deposited in the chambers causing cases to stick,which is a driving factor in why chamber cleaning is so important when using the steel cased ammo.
As for direct effect on ejection distance and function of related components...I'd say the steel cases have little to nothing to do with how far the cases are tossed as the ejector spring and how fast the BCG is moving due to gas provided/timing and buffer used.Extractor sping,insert and o-ring can all have an effect as well.
As far as added stess to the extractor,I'd say the the steel cases contribute little to no concern and the cycle rate detailed again by how close to proper the barrel is gassed.Then you have to factor in that the steel cased ammo in most cases is loaded to the weak side.
While I would not advocate the use of cheap steel cased ammo for defensive use I have yet to see any issues as range fodder.If a person burns as much ammo as some here,I can say for a fact that the cost savings in just a year is dramatic.
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