I have noticed pellets sized all the way head and skirt has a difference in springers more than PCPs and have experienced better accuracy in some but not all guns. HW springers liked sized pellets the most. Specifically 0.1785 using the old Beeman Pell sizer and tried all sizes and all calibers and this one stood out the most.
I had a Beeman RX1 in .20 cal and it did benefit from using a Beeman sizer with the Japanese made 11gr Silver Jet pellets. Excellent accuracy and additional 15 fps to boot.
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