Groups and group centering by Wayne Latham

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Groups and group centeringby Wayne Latham
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• The Objective of Target Rifle Shooting
• as a Sport
• Every time we go to the firing mound it is our
  intention to fire a series of shots with all of
  them falling within the bullseye so that our
  score is greater than all the other competitors!

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What is a group?

• A group is the pattern a series of shots forms
  on the target
• Waynes Rule 1
• ONE SHOT DOES NOT A GROUP MAKE!

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Measuring a Groups Size MINUTE OF ANGLE
(MOA) (Also known simply as Minute or
PointMOA 1 inch (say 25mm) per 100 Yards
Distance in Yards One MOA
     
300 3 inches 75mm
400 4 inches 100mm
500 5 inches 125mm
600 6 inches 150mm
700 7 inches 175mm
800 8 inches 200mm
900 9 inches 225mm
1000 10 inches 250mm
     
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Target Dimensions BULLSEYE DIMENSIONS AT
EACH DISTANCE(NRAA Standard Shooting Rules
Chapter 13)
Distance in Yards Size in mm MOA
     
300 130 1.7
400 173 1.7
500 260 2.0
600 290 1.9
700 320 1.8
800 510 2.5
900 510 2.2
1000 510 2.0
     
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Rule 2 ALWAYS MOVE TOWARDS THE CENTRE OF THE
TARGET
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Using our Sighting Shots

• ? Arguably, our sighters are the two most
  important shots we will fire in any match.
• Rule 3
• ALWAYS FIRE PERFECT SIGHTERS
• Remember Rule 1
• ONE SHOT DOES NOT A GROUP MAKE!

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Recognising Shots Outside the
GroupRule 4IGNORE SHOTS OUTSIDE THE
GROUP!Rule 5NEVER ADJUST YOUR SIGHTS ON A
BAD SHOT!
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The Perfectly Centered Group

• ? A perfectly centered group is one in which the
  pattern of shots has the Pin Hole in the
  middle!
• ? A group of shots, however large or small, where
  the Pin Hole is not in the middle is not a
  centred group!
• Rule 6
• PLOT YOUR SHOTS TO HELP YOU RECOGNISE THE
  CENTRE OF THE GROUPRemember Rule 2ALWAYS
  MOVE TOWARDS THE CENTRE OF THE TARGET
• ? Centre the group! Dont Chase
  the Spotter!

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Target Dimensions

• (Refer SSRs Chapter 13)
• There are three Classes of Targets  
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• (a) Third Class
• 1200mm x 1200mm square (48 inches square)
  (300 and 400 yards) 
• (b) Second Class
• 1800mm x 1800mm square (72 inches Square)
  (500, 600 and 700 yards)
•  
• (c) First Class
• 2400mm x 1800mm (96 inches wide x 72 inches high)
  (800, 900 and 1000 yards)
• (continues next slide..)

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Target Dimensions cont
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Sights

• ? Iron Sights
• ? Know Your Iron Sight

Your elevation and windage adjustments may be one
of the following 0.25 MOA 4 clicks to the
minute (4 clicks from the edge of the Bullseye to
the Pinhole)0.5 MOA 2 clicks to the minute (2
clicks from the edge of the Bullseye to the
Pinhole)0.3 MOA 3 clicks to the minute (3
clicks from the edge of the Bullseye to the
Pinhole)
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Sights

• ? Telescopic Sights

? Know Your Telescopic Sight
Your elevation and windage adjustments may be
one of the following 0.125 MOA 8 clicks to the
minute (8 clicks from the edge of the Bullseye to
the Pinhole)0.25 MOA 4 clicks to the minute (4
clicks from the edge of the Bullseye to the
Pinhole)0.5 MOA 2 clicks to the minute (2
clicks from the edge of the Bullseye to the
Pinhole)
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What Have We Learnt?

• ? Bullseye and Other Scoring Rings in MOA
• - MOA from the edge of the Bullseye to the Pin
  Hole - generally 1 MOA
• - Target sizes in MOA learn the three
  different target sizes and how that
• knowledge can help you measure the distance
  from your last shot to the
• Pin Hole.
• ? Plot Your Shots to Highlight the Group
  Formation- Sighters one shot does not a
  group make!
• - Second shot establishes a group SO, MOVE
  GROUP OVER THE PIN HOLE.
• ? Move the Centre of Your Group Over the Pin
  Hole
• - pull good shots.- watch the weather
  changes.- watch the shape and formation of
  your group.- watch the centre of you group in
  relation to the Pin Hole.

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Remember, Remember, Remember!

• ? Remember - Plot your shots on a plotting sheet
  which will help you recognise
  where your group is forming.
• ? Remember - Always centre the group over the
  Pin Hole!
• ? Remember - 1.0 MOA from the Bullseye line to
  the Pin Hole
• ? Remember - 0.5 MOA from the Central Bull line
  to the Pin Hole
• ? Remember - 1.5 MOA from the Inner four line
  to the Pin Hole".

ADJUST, ADJUST, ADJUST, ADJUST, ADJUST,
ADJUST, ADJUST !!!!!!
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Waynes Rules

• 1. ONE SHOT DOES NOT A GROUP MAKE!
• 2. ALWAYS MOVE TOWARDS THE CENTRE OF THE TARGET!
• 3. FIRE PERFECT SIGHTERS!
• 4. IGNORE SHOTS OUTSIDE THE GROUP!
• 5. NEVER ADJUST YOUR SIGHTS ON A BAD SHOT!
• 6. PLOT YOUR SHOTS TO HELP YOU RECOGNISE THE
  CENTRE OF THE GROUP!
• 7. CENTRE YOUR GROUP OVER THE PIN HOLE
• 8. START AGAIN AT RULE 1

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Ta DaThe End

• Thank you for your time and attention..
• any questions?
• Now go out there and fire a
• 50.10 or 60.10!!