Never found that magic pill that shoots 1/2 moa from my STW. Can't say I didn't try. Have been looking through my records beginning in 2003 and here are the different component's and some of variation's of them. Powers:H4831sc IMR4831 IMR4350 H1000 IMR7828 IMR7828SSC RETUMBO Cases: r-p Primers: FEDERAL..CCI Bullet's: Sierra 160 & 150 HPBT 120 SPT Nosler 140 & 160 ACCUBOND & PARTION. Loads were started just over minimum published and worked up until pressure signs or groups open up. Played with length of 3.600 down to 3.550. 3.600 being max for my mag. The gum is a Winchester mod 70 in SS. floated barrel, glass bedded with a Leupold 3x9. And the nut behind the trigger is a fair shot. I use this gun for all my big game hunting and have had great success, just would like to see some better groups. My best is.. Nosler 140 AB over 74.5 of 7828 produces ABOUT .5 to .75. 3 shot groups.@ 100yds. that's as good as it gets? Thanks, Mike.