Measuring groups

27 February 2002, 05:14

Alex Szabo

Frasier,

You may take a caliper (digital or analog) and measure the outside furthest points. Subtract the caliber and that reading is the grouping.

To wit: G = F - c
where:
G = grouping
F = Furthest points
c = caliber

Example:

At 100 yds with a 30-06 one shoots a group of 5 shots. The furthest point measures 1.25 inches. Your grouping therefore yields 0.942 inches. Enjoy!

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Best regards,
Alex

Democracy is two wolves and a lamb voting on what to have for lunch.
Liberty is a well-armed lamb contesting the vote! - Benjamin Franklin 1759

27 February 2002, 05:30

<ultramag>

Center to center of the furthest apart bullet holes is a little simpler way of saying it.

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May your chambers be true to your bores.

27 February 2002, 08:55

ricciardelli

http://stevespages.com/measuretargets.html

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http://stevespages.com/page8.htm

27 February 2002, 13:33

Alex Szabo

quote:
Originally posted by ultramag:
Center to center of the furthest apart bullet holes is a little simpler way of saying it.

Ultramag,

Is it indeed from center to center? I was operating under the premise that from outer to outer hole...

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Best regards,
Alex

Democracy is two wolves and a lamb voting on what to have for lunch.
Liberty is a well-armed lamb contesting the vote! - Benjamin Franklin 1759

27 February 2002, 14:32

<Gary Rihn>

Alex-

Your formula does indeed give you center-to-center. Your way of measuring is also correct. Ever try to find the "center" of a hole?

27 February 2002, 15:00

Clark

I just read steves pages [url above], and I learned something:

There are more meaningful ways to measure a group than the maximum spread.

27 February 2002, 16:06

Atkinson

That is correct and that is the benchrest rules of measure. that is measure the two furtherest outside distances and subtract the caliber

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Ray Atkinson

ray@atkinsonhunting.com
atkinsonhunting.com

27 February 2002, 16:08

Atkinson

That is correct and that is the benchrest rules of measure. Measure the two furtherest outside distances and subtract the caliber or use Rays method measure the two outside distances and divide by two, it'll make you feel good about your gun and after all thats whats important, whats in a silly millimeter.....

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Ray Atkinson

ray@atkinsonhunting.com
atkinsonhunting.com

28 February 2002, 01:35

<Gary Rihn>

If I shoot a five shot group, can I divide by 5?

28 February 2002, 05:01

rick3foxes

quote:
Originally posted by Gary Rihn:
If I shoot a five shot group, can I divide by 5?

Yes, but only if you use MatchKings...

Oops... Gotta go now!!