PRONE ERROR DIAGNOSIS CHART
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If you're struggling to understand why you can't shoot the perfect card then this short guide may help you discover what's not quite right. If your groupings looks like one of these diagrams then the possible causes are listed next to them.
As helpful as this is it can only be a guide, and as you'll see, there are often several possible reasons.
Try one correction at a time, and give it a chance to make a difference before moving onto the next possible solution.

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Tension in left arm
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Sling too tight
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Excessive cheek pressure
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Excessive shoulder pressure
(shoulder too tense)

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Breathing incorrectly
Only release trigger after you have totally exhaled and have a perfect sight picture

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Left elbow too far out
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Pressure from left thumb
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Natural position aligned to right
of target -
Right elbow slipping

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Left elbow too far under the rifle
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Pressure from left fingers
-
Natural position aligned to left of target

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Canting to the left
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Possible loose sling

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Canting to the right
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Excessive right hand grip
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Trigger snatch
-
Possible loose sling

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Hollow group
Focus on the foresight not the target

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Physical effort may be forcing sights up onto target
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Butt too high in shoulder
-
Possible loose sling

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Canting to the left and right

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Physical effort might be forcing sights down onto target
Butt too low in shoulder
Sling too tight