Have an important ? on shot groups

South Paw Shooter

South Paw Shooter

Member
OK just got home from testing some loads I made this afternoon. My question is HOW DO YOU MEASURE YOUR SHOT GROUP. Is it measure the two furthest edges or the center of the two furthest holes.
I made up some rounds today for my 22-250AI and I was seeing if I could balance a 64gr Berger FB Varmint in a 1-14 twist barrel.
I pretty sure I did it. Depending on how you measure the group I either shot a .350 or a .189 3shot group made my adjustments and put one dead center of a 1 inch target sticker. The temp was in the mid 30's and a very faint wind if any.
 
.328-.224 would be .104 which is excellent, but it does appear in the picture that your caliper needs to be opened a little on the left side. The picture is a bit to fuzzy to see really well, but it looks like you definitely have a shooter. Congrats! Keep up the good work.
 
Ok yes it is 224 you are right I am not sure what I was thinking there. I think you may be right about the calibers I was having problems getting them to hold still.
 
My brother would call that rifle useless because you missed the sticker
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I've tried to explain the difference between POA and POI especially on a hunting rifle and he looks at me a lot like my dog does when I discuss philosophy with her.
 
NdIndy,
Quote:he looks at me a lot like my dog does when I discuss philosophy with her. Sometimes dogs have more common sense understanding than brother-in-laws do...
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Southpaw. using the On Target system will give you an image similar to this one:
200yard60V-Max-Rem700b.jpg


my problem is getting the text to print on the finished calculation...I just haven't figured out that trick yet, but then, I'm considered Techno -Challenged...
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Ok so I have group that center to center does not equal edge to edge minus bullet diameter. what one would I go with? It seems that everyone would take the smallest group. Here is my target.
23gr8208xbr68grv-match001.jpg

I used the program mentioned here and it said over a .5 that cannot be right. edge to edge on the orange is 2 inches. 5 shot group at 100 yards.
 
If the orange portion is 2" edge to edge and you turn the group sideways, with the edge of the outside bullet hole at the edge of the orange and measure across to the edge of the farthest bullet hole toward the center, that would be about .5"...minus .224" (assuming it's a .223 round), that would leave you with a .276" group...

I tried to save your photo over to my photo program and it wouldn't work...Measuring the image on my screen, the orange section is 2 5/8" so the relationship is about right..as it measures .5" at that scale...without calipers...

At any rate, it's a good group...
 
yeah the 68 gr hornady bthp. If I measure center to center it is .313. If I measure edge to edge minus bullet diameter .468-.224=.244. oh well i am very happy with it no matter what. thanks for the help.
 
Gettin to picky here folks. Its a frickin ragged hole. Don't get much better than that!! Still fun for braggin rights though, ain't it!!! Good shootin'
 
Well I got a shot on a coyote today and had only a second to take the shot and missed literally by a hair actually that's all that flew was hair so I was a little high I would guess. So I will go out in the morning and try again
 
Originally Posted By: deerhunterjjI measure from the outside edge of the longest point of the group then subtract the bullet dia.

ok but according to most things I have read the hole in the paper is not the diameter of the bullet. the hole in the paper is smaller. I know it is a good group but when I get to the bragging rights of my target I would like it to be accurate. Selfish this sounds but really the truth of most anyone who says "well once I shot this target". They would like it to be accurate. Just curious. Perhaps I should take the biggest out of the 2 general consensus and say that is the size.

Are we still talking groupings?
 
What I like best about the On Target program is that I scan my targets rather than taking a picture. The scanner scans the exact size of the target on my screen, and the program lets me select the caliber I am shooting with the correct bullet hole size.

When I center the cursor over the middle of the hole, then I don't have to worry over whether the outside edge of the hole in the paper is correct. The computer prints the correct bullet hole and takes my fudging out of it.

Both of those targets shown are great groups in my view, but as South Paw Shooter says, it doesn't always translate to a hit. That adrenaline rush is one more difficulty for precision when looking at an animal instead of a target.
 


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