Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Question About "Group Size"
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Steve Shelp" data-source="post: 22370" data-attributes="member: 22"><p>Jim,</p><p> It doesn't matter if the bullets are touching or not. You simply measure outside to outside of the 2 farthest shots and subtract your caliber size. They could be overlapping by 90% or 3" between the shots, the same method applies. This will give you the center-to-center measure of any 2 bullet holes in a target. Now when they truely cut a ragged hole like the BR guys do it's really hard to tell where the 2 farthest edges are, so optical lenses and special measring devices are used in competition. And even then it's not an exact science.</p><p></p><p>Also one other note: the black ring left in a target measures smaller then the actual bullet diameter. For instance if you measure a .243 caliber bullet hole it will probably measure about .228 +-. But this is really splitting hairs and only comes into play when trying to determine a BR reocrd or something. When it comes to measureing my test groups at home and stuff I keep it simple and subtract the actual bore diameter rather than measurering what size hole my bullet produces in a particualr type of paper target, what type of backer it has, etc. </p><p></p><p>Hope this helps,</p><p>Steve</p><p></p><p>[ 04-17-2002: Message edited by: Steve Shelp ]</p></blockquote><p></p>
[QUOTE="Steve Shelp, post: 22370, member: 22"] Jim, It doesn't matter if the bullets are touching or not. You simply measure outside to outside of the 2 farthest shots and subtract your caliber size. They could be overlapping by 90% or 3" between the shots, the same method applies. This will give you the center-to-center measure of any 2 bullet holes in a target. Now when they truely cut a ragged hole like the BR guys do it's really hard to tell where the 2 farthest edges are, so optical lenses and special measring devices are used in competition. And even then it's not an exact science. Also one other note: the black ring left in a target measures smaller then the actual bullet diameter. For instance if you measure a .243 caliber bullet hole it will probably measure about .228 +-. But this is really splitting hairs and only comes into play when trying to determine a BR reocrd or something. When it comes to measureing my test groups at home and stuff I keep it simple and subtract the actual bore diameter rather than measurering what size hole my bullet produces in a particualr type of paper target, what type of backer it has, etc. Hope this helps, Steve [ 04-17-2002: Message edited by: Steve Shelp ] [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Question About "Group Size"
Top