A tripod with an adapter that your rifle will smoothly recoil through. This gives you correct shooting height and stops leg jump. Do a forend hold if you have a light rifle with recoil. Add a rear bag (jacket rolled up) . Ensure the shooting position is relaxed and in line. Use a ballistics solution that calculates all your components and spits out the right solution. Steep uphill and downhill prior to this system suffered from a decreased hit rate.