Guys I am new to this so don't laugh. I have a winchester model 70 chambered in 300 weatherby. The best groups I've got out of the factory barrel is 3/4". I would like to get into this long range thing and would like for it to at least shoot under 1/2". I am considering rebarreling. A few questions: 1. Would you go back with 300 wby or another (I want to stay with 30 cal)? 2. What barrel should I go with (Brand) (one friend told me Hart any thoughts on this)? 3. What twist, contour, etc if I want to shoot 280 grain Nosler accubond or ballistic tips?(or if either sound stupid let me know) 4.Should I just start over with a new gun? (I have a bell and carlson thumbhole stock, Leupold vx3 4.5-14)