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Congrats……the tx200mk3 is a fine springer and looks like yours is performing as it should. Mine liked both the jsb 15.89 and 18.13 the best with a slight edge to the 15.89gr. Give em a try if you havent. I did vortek mine and it improved the accuracy alot. However…….mine out of the box was not shooting as well as yours is out of the box. I have to agree….no need to vortek yours right now. The stock spring on mine had a slight bow in it lengthwise. That bow randomly changed the recoil of the rifle depending on how the spring was rotated from shot to shot. The stock spring has no spring guide so it can recoil both forward and out in any direction if its not perfectly straight. After the vortek, which has a spring guide, mine was lights out accurate.