it has a 1 in 8 twist i live down in southern nm were we have a lot of wind i wanted a biger bullit to see if i can get a little more stable in the wind but none of my loading books has a load for the 75gr bullit thanks
I think the Sierra manual has load dope for their 69 MK in .22-250. You might resort to the SWAG method, then subtract another 5%. Seriously, you should be able to cautiously extrapolate a starting load, then work up.
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