Twinson, I have used 77 smk for 2&3 and 80 smk at 600. the 77's I load to mag lenght with 24.5 of varget. the 80's are .020 short of the lands also with 24.5 of varget. some folks use 77's at 600 which can work ok if there is very little wind. if you have a Krieger barrel, than you may need to drop the charge a little, tighter barrel = more pressure. these are loads that worked well for me and several other folks have used it with good results. remember that 600 is about reading the wind. hold hard and have fun.
CRB
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