Remington 700 5R: 3-round group vs. 9-round group?

Why can the 9-hole/ 9-shot group can show a rifle's accuracy easier?, Why do3-shot groups have a tendency to distort our idea of a rifle's accuracy?

***EDIT: Rifle at 6:17-6:24 were shot at 400yards, not 600 yards***


Bloke on the Range: Blokesplaining why 3 round groups... aren't
https://youtu.be/4dhPTf18_mw

Rifle: Remington 700 5R .308

Scope: IOR Valdada 3.5-18mm x 50
https://tinyurl.com/y8pbpvh2

Seekins Precision 35mm Rings
https://tinyurl.com/y7m7tpm7

Vortex Bubble Level 35mm
https://tinyurl.com/y8qb98be

Harris Bipod: Hinged Base 6-9in
https://tinyurl.com/y7ft48f9

The Outdoor Connection Sling Coyote Brown
https://tinyurl.com/y7g6odxl

Butler Creek scope caps
https://tinyurl.com/yac7vcb4

Load data:
.308 SMK 175gr
FC GMM cases
CCI BR-2 primers
43.5gr Varget
2.850in OAL


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