So my current quest for prefect slugs on factory tune!! I love 17.5gr but the diameter and length of bullet get the all turned sideways if your not careful! Howler are still best.. 3 crows took in high winds range from75-85yards
Mine loves the .217 23 grain nsa slugs. It has the stx liner also and will do one hole groups @50 yards no problem. I tried the 17.5 grain nsa slugs also and they were turning sideways like yours. Plus they weren’t as accurate as the 23 grainers