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How do you measure your groups? |
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Gil P.
Optics Journeyman Joined: February/01/2012 Location: Henderson, NV Status: Offline Points: 316 |
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Posted: April/03/2013 at 15:14 |
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The way I do it is I measure the two furthest bullet holes away from each other edge to edge, and then I subtract .308 (bullet diameter) from that number to get a center to center number. I am using electronic calipers to measure my group sizes.
I am asking because, I have seen other 5 shot groups that measure .5 inches (shot with an unknown caliber) that look almost like all the bullets are going into the same hole. So, how do you measure your groups? And, what is the standard way of measuring them? I think I might be measuring mine incorrectly. |
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Urimaginaryfrnd
MODERATOR Resident Redneck Joined: June/20/2005 Location: Iowa Status: Offline Points: 14964 |
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Center hole to center hole is the most accurate measurement.
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"Always do the right thing, just because it is the right thing to do". Bobby Paul Doherty Texas Ranger |
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budperm
Optics Retard show me your sheep!! Joined: January/01/2009 Location: Pennsylvania Status: Offline Points: 31710 |
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+1! Your doing it right |
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"Peace is that brief glorious moment in history when everybody stands around reloading".
--Thomas Jefferson |
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Mike McDonald
Optics Journeyman Joined: September/01/2004 Status: Offline Points: 739 |
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I generally cover them with a #2 pencil eraser.
If I can see anything outside the eraser I know I've made an error and must practice a while longer. Gil your way will work fine. Center/Center also works well.
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Gil P.
Optics Journeyman Joined: February/01/2012 Location: Henderson, NV Status: Offline Points: 316 |
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Haha very funny, but I don't think im quite there yet. Thanks for the help guys, I suppose the one hole looking group I saw wasn't actually measured. They simply stated a guesstimated size and it was probably a lot smaller than stated. On a side note, I sent my rifle to Phoenix Custom Rifles to have a New barrel put on, barrel channel opened, new recoil lug installed and some action truing done. I should be getting it back in a about a month (maybe less). Then, with practice I can see my groups REALLY start to shrink! Ill post pictures for you all when it gets here. |
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Easy come easy go
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stickbow46
Optics Master Extraordinaire Joined: January/07/2009 Location: Benton, Pa Status: Offline Points: 4678 |
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+2 center hole to center hole.
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Pearls of Wisdom are Heard not Spoken
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budperm
Optics Retard show me your sheep!! Joined: January/01/2009 Location: Pennsylvania Status: Offline Points: 31710 |
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Gil, Mike might of been kidding about the pencil eraser and then again he might not....
Mike is really THAT good of a shooter.
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"Peace is that brief glorious moment in history when everybody stands around reloading".
--Thomas Jefferson |
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Kickboxer
MODERATOR Moderator Joined: February/13/2008 Status: Offline Points: 23679 |
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I'm pretty sure he wasn't kidding...
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Opinion,untempered by fact,is ignorance.
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Gil P.
Optics Journeyman Joined: February/01/2012 Location: Henderson, NV Status: Offline Points: 316 |
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Never doubted him; I know there are some pretty darn incredible shooters out there.
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Easy come easy go
Always remember that you are absolutely unique. Just like everyone else. |
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Mike McDonald
Optics Journeyman Joined: September/01/2004 Status: Offline Points: 739 |
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seriously, here's how I measure mine;
You know how, when you are looking at the bullet holes on light colored paper, there's a black ring around the circumfernece of the hole? I use a dial caliper and a magnifier and measure from the outside of that black ring, which theoretically is the true diameter of the bullet as it passed through the target, to the outside of what looks to be the farthest hole on the other side of the group. Then I shift 90 degrees and measure another two holes. If I've done my part we're measuring a single hole, looking at the outside of the radii of the group and measuring for example, east/west, then north/south. I take the largest measurement and subtract bullet diameter for group size. I then measure group center to the center of the target, which is the aiming point. That's the true group measure for me; did I actually put the pointy thingies where I was aiming? For example, here's a test group I fired prone/cold bore when testing the XOTIC prototype for Chris;
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Mike McDonald
Optics Journeyman Joined: September/01/2004 Status: Offline Points: 739 |
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Sorry, 'puter locked up.
Anyway, you can see it's a decent group with factory ammo, 1 flyer but it happens. It's also about .35" away from target center, whcih was the aim point, so for me, that's a 0.345 inch group.
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budperm
Optics Retard show me your sheep!! Joined: January/01/2009 Location: Pennsylvania Status: Offline Points: 31710 |
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FLyer!?!?!? where?
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"Peace is that brief glorious moment in history when everybody stands around reloading".
--Thomas Jefferson |
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Sparky
Optics Master Extraordinaire Joined: July/15/2007 Location: SD Status: Offline Points: 4569 |
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Very nice!
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Kickboxer
MODERATOR Moderator Joined: February/13/2008 Status: Offline Points: 23679 |
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Lower right of the group...
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Opinion,untempered by fact,is ignorance.
There are some who do not fear death... for they are more afraid of not really living |
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Kickboxer
MODERATOR Moderator Joined: February/13/2008 Status: Offline Points: 23679 |
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What he didn't tell you is that one was with his eyes closed...
Mike, that is some outstanding shooting, Sir... just outstanding...
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Opinion,untempered by fact,is ignorance.
There are some who do not fear death... for they are more afraid of not really living |
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budperm
Optics Retard show me your sheep!! Joined: January/01/2009 Location: Pennsylvania Status: Offline Points: 31710 |
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but he said he was having an 'off day'
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"Peace is that brief glorious moment in history when everybody stands around reloading".
--Thomas Jefferson |
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Urimaginaryfrnd
MODERATOR Resident Redneck Joined: June/20/2005 Location: Iowa Status: Offline Points: 14964 |
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Yep. Mike has forgotten more than most people will ever know about shooting.
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"Always do the right thing, just because it is the right thing to do". Bobby Paul Doherty Texas Ranger |
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Kickboxer
MODERATOR Moderator Joined: February/13/2008 Status: Offline Points: 23679 |
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and STILL knows more...
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Opinion,untempered by fact,is ignorance.
There are some who do not fear death... for they are more afraid of not really living |
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robbie
Optics Apprentice Joined: November/13/2007 Location: United States Status: Offline Points: 141 |
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I walk up to the target, take a look, and say: "hmmm, thats about an inch" or "half inch," or whatever it looks to reasonably be.......
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8shots
Optics Jedi Knight Lord Of The Flies Joined: March/14/2007 Location: South Africa Status: Offline Points: 6253 |
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If I do a three round or five round grouping I use the same method... I count three or five holes and call it could. If I find one or two holes short on the target I know my grouping can be tightened up a wee bit.
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