i use a 18 # spring in my captive guide rod. ( personal choice.) i understand the logic but really dont see the poinI in switching spring poundage with every different load. A bit much. i stick with what works well with all loads ( again presonal preference.) Over 2000 rnds not 1 issue with feeding nor gun. XD-Tactical 9MM
I use the factory recomended #19 Wolff spring in my XD-9 tactical. I shoot 125 grains FMJ roundnose rounds in it. The brass ejects about 18" (has burned me with empties a couple of times) back and right. Nice gentle recoil and smooth cycle.
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