It was shooting about 18" low and a little left at 50 yards with my initial load of 60 grains of 2Fg Goex, a .490 round ball, a 0.018" ticking patch lubed with Track of the Wolf's mink oil tallow, and a CCI No.11 cap.
Grouping with the 60 grain load was 3 to 4" from the bench. IOW, not very good. So, I increased the charge to 70 grains and the rifle started grouping nicely. My last three shot group is below. It's the one hole in the center.
That's 2 in the X-ring and one just outside it in the 10. I can certainly live with that. (The target is full of .22 holes from taking my daughter to the range.)
I still want to experiment with different charges, patch thicknesses, and ball size.
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