Here's my take on the issue, and how I would go about it.
Start by benching the gun and zero at 100 yards.
If you're using a 2 MOA dot then zero on a 4 inch black circle. You should be able to see a black ring around your red dot, know that its centered, and adjust the scope until you're shooting the center out of the target.
Measure your benchrest group size at 100 yards, 10rds, on a zeroing target - assuming you did your part as a shooter, you have identified the mechanical accuracy of your gun / optic / ammo.
Next bench the gun and shoot at 50 yards, realize that you have a difference in your point of impact. (Where is your group center..?)
Probably going to be about 1.5 inches low if you're using an Aimpoint so account for this by holding over your desired impact area by 1.5 inches.
Your benched group size at 50 yards should be half as big as your group size at 100 yards.
When training, focus on Accuracy... OR Speed, not both. At least not at first.
You should realize that you're not actually going to shoot the rifle to its limit while standing unsupported.
Find your Natural Point of Aim with the rifle, allowing you to shoot with maximum stability, then adapt that stance to a combat shooting position.
AFTER you've achieved the Accuracy standard that you desire from the benchrest, your Natural Point of Aim & your combat shooting position, THEN work on speed.
When working on speed designate a "HIT" zone on the target and work on hitting that zone, don't worry about where the bullet struck inside it as long as its inside.
Snap the gun up, see your sights/dot, and break a clean shot into your HIT zone.
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