Most folks just practice with their firearm from the STANDING position because of the limitations of the FLAT RANGE but in reality we need to be shooting from all FOUR positions every time we train with a firearm (handgun or long gun).
Taking a Knee
This is one of the first things I learned in becoming a rifleman and hunter from my father. Taking a knee before you make a shot does a few things: One, it lowers your center of gravity and makes accuracy easier. 2. It lowers your profile (from 4 or 2 legged creatures) 3. It enables you to go prone much quicker. You will find as a Rifleman there is no better friend than Terra Firma!
Take a Seat
Although not used as much in a tactical sense, unless from behind cover, the Sitting position is a great drill for hunting. I recommend shooting this drill frequently with your DM/Scoped rifle out to 300-400 yards.
Prone is LIFE
There is no other position to a rifleman better than Prone and if you are not shooting EVERY rifle drill you have from this position you are cutting yourself short.
Knocked on your Ass
Shooting from your back is something a lot of people don’t consider but take a look at REAL WORLD CCTV/Dashcam footage and you will see it is a position that a lot of armed civilians find themselves in regularly!
The simplest way to blend these drills together is the Two Drill: two rounds from each position at 15 yards for handgun and 75 yards for rifle. Integrate reloads and malfunction clearances as well as shooting from behind cover and adding some cardio/stress like this DRILL.
Train Hard and Realistically.