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My COAL for 175gr smk is 2.750 and that puts the bullet just touching the lands . My 190gr smk COAL is 2.850
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As stated above start off the lands. Most rifles will give best accuracy between .001 and .004 off the lands. Experimentation is the only way to know what works in your gun.
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Hope that helps and if I did something wrong please let me know so I don't blow my face off .
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Any time you change anything; ( powder lot, bullet, primer, or depth of bullet seating that makes the case volume smaller) reduce your powder charge and work up the load again. That prevents big scary booms near your face
