Long Range Hunting Online Magazine Measuring group size.
 Home LRH Store Forums Long Range Rifles Articles Reviews Video G7 Ballistics Calculator Rules & FAQ Register Search Today's Posts Mark Forums Read

# Measuring group size.

#1
10-28-2004, 10:56 AM
 Junior Member Join Date: Jan 2004 Posts: 11
Measuring group size.

I know this may seem like a no brainer to the experienced on here - but what is the standard method of measuring group size? I see some very small groups listed on here and would like to know how they are measured.
#2
10-28-2004, 11:44 AM
 Bronze Member Join Date: Aug 2004 Location: Arizona Mountains Posts: 50
Re: Measuring group size.

Back in the good old days it was easy to measure group size. You simply measured the distance between the center of the two widest shots. Today, many groups are one ragged hole and it's impossible to identify individual shots much less the center of the two that are farthest apart. So, what you do is measure the outside of the group at it's widest or biggest point and subtract the diameter of the bullet. For example, you shoot a 30 caliber group that measures .679 at it's biggest point. .679 minus .308 will give you, hmmm lets see, 8 from 9 is 1, carry the 3, two decimals over, oh hell just use your pocket calculator and the group size comes to .371. In benchrest parlance this would be called a Big 3 and would be a very good group regardless of caliber. You don't really need a calculator unless you're ignorant like me but you probably will need a caliper that will measure in Thousandths of an inch. [img]images/icons/grin.gif[/img] [img]images/icons/grin.gif[/img]

[ 10-28-2004: Message edited by: Cheechako ]

[ 10-28-2004: Message edited by: Cheechako ]
#3
10-28-2004, 04:06 PM
 Platinum Member Join Date: Dec 2001 Location: Long Island, New York Posts: 2,091
Re: Measuring group size.

For informal measuring of your own groups that are not one hole, just lay the jaws of a dial caliper across the centers of the two farthest bullet holes and you have it. No math required. [img]images/icons/wink.gif[/img]

For clover leaf groups or the virtual "one holer", you will need to follow Cheechako's advise. For getting accurate measurements of really tiny groups (match results) special measuring equiptment is used.
#4
10-29-2004, 11:36 PM
 Gold Member Join Date: Jan 2003 Location: centre,alabama Posts: 948
Re: Measuring group size.

What do you subtract for 6mm ??
#5
10-30-2004, 08:43 PM
 Bronze Member Join Date: Apr 2002 Location: Whittemore, MI Posts: 37
Re: Measuring group size.

Sniper2
6mm=.243
6.5mm=.264
7mm=.284
#6
10-31-2004, 12:05 AM
 Bronze Member Join Date: Oct 2004 Location: CA Posts: 63
Re: Measuring group size.

I see a lot of shooters give their score in MOA. They aren't really figuring MOA are they, but rather measuring in inches.

Is there a formual they are using converting inches to MOA by considering the distance they are shooting?
#7
10-31-2004, 10:39 AM
 Bronze Member Join Date: Aug 2004 Location: Arizona Mountains Posts: 50
Re: Measuring group size.

Green

A MOA is actually 1.047 inches at 100 yards. But, having said that, just about everybody thinks in terms of inches even when they say MOA. So for all practical purposes, Inches and MOA are the same thing. This will probably start an arguement but it's one that has been waged many, many times before.

 Bookmarks

 Thread Tools Display Modes Linear Mode

 Similar Threads for: Measuring group size. Thread Thread Starter Forum Replies Last Post walserjack Long Range Hunting & Shooting 13 07-28-2011 03:18 PM drenge Reloading 16 07-15-2009 08:53 AM mtmuley Long Range Hunting & Shooting 8 03-24-2008 10:44 PM ven Long Range Hunting & Shooting 4 02-11-2007 02:17 PM travis20032003 Long Range Hunting & Shooting 2 10-24-2002 11:06 AM

 Current Poll Do you wear hearing protection while hunting? Usually do Usually do not No but I probably will in future
 Current Poll - 2 Do you have a high speed Internet connection? Yes, DSL, satellite, wireless or something else. - 89.18% No, only dialup right now. - 10.82% Total Votes: 3,049You may not vote on this poll.

All times are GMT -5. The time now is 03:14 PM.