first i have a shilen 308 barrel 25.5 inches long using 168 smk. next borrowed my crony to some guys and they shot it and said oops sorry. so heres the question. in my winchester book it shows 42 grns of tac as max load for 168 smk but on the ramshot web it shows 44.something. any way I was shooting 42.5 but was not getting good accuracy so a did a ladder test from ramshots min to max and found that 43.1 is very accurate at 300 shooting half inch or less groups but it is putting a lot of fouling in my barrel but just in the middle of the length not at either end but the 42.5 is giving me none to speek of. and I do not know my bullet speed. any ideas