Update: See Post #20
I've done one of these before. This time I decided to look at the shot dispersion of my new BadRock 6mm ARC rifle.
There are caveats of course. I think the rifle is incredibly accurate in the right hands. In my hands, well, lets just say I have work to do as you will see below.
I wanted to use At Target for the stats but I could not get a response from them so I had to improvise. I basically reversed engineered the graphics using Photoshop and used excel to do the calculations. Then I was able to combine the groups into Ballistic-X where I was then able to make measurements. It wasn't easy and I don't plan to do this very often! The results are very interesting to me. They showed me something I kind of suspected - I might need more attention to my rear bag and grip hand management.
So, here we go... I shot 11 targets in mostly 3-shot groups, with 2 of them 4-shots and 1 with only 2-shots. Total shot count of 34-shots. All shot in one session, from the bench, but using a bipod and a Precision Underground rear bag. No fancy Benchrest setup. Not even a fancy bunny ear rear bag.
This was the target I used. I print them myself. It has a red .1mil center and a .3 mil diamond which equates to 1.08 inches side to side.
The first group top left was the cold bore group. It told me I still had to adjust my new Razor scope so I did in the second group. I counted those cold bore shots in the dispersion test. Shown below.
I then shot the rest of the groups. Below are the stats. First is the Max Spread from Ballistic-X. 34-shots went 1.241 MOA.
I then used Ballistic-X to gather individual shot info. I had to find the center of the group so I could do a mean radius. I plugged all that into a spreadsheet. Below is the calculated Group center. The mean radius of all shots to Group center was calculated from this - .352 Inches.
Then I calculated the percentage of shots inside 1 MOA, shown in the transparent blue circle below. 75% of the shots were 1 MOA or less.
And the last image, which is really important to me, shows that dispersion was not random. In fact, there are two tightly packed sub-groups (red ellipses) in the whole mess. This tells me that it's not only about the rifle and ammo - IT includes ME!
I've done one of these before. This time I decided to look at the shot dispersion of my new BadRock 6mm ARC rifle.
There are caveats of course. I think the rifle is incredibly accurate in the right hands. In my hands, well, lets just say I have work to do as you will see below.
I wanted to use At Target for the stats but I could not get a response from them so I had to improvise. I basically reversed engineered the graphics using Photoshop and used excel to do the calculations. Then I was able to combine the groups into Ballistic-X where I was then able to make measurements. It wasn't easy and I don't plan to do this very often! The results are very interesting to me. They showed me something I kind of suspected - I might need more attention to my rear bag and grip hand management.
So, here we go... I shot 11 targets in mostly 3-shot groups, with 2 of them 4-shots and 1 with only 2-shots. Total shot count of 34-shots. All shot in one session, from the bench, but using a bipod and a Precision Underground rear bag. No fancy Benchrest setup. Not even a fancy bunny ear rear bag.
This was the target I used. I print them myself. It has a red .1mil center and a .3 mil diamond which equates to 1.08 inches side to side.
The first group top left was the cold bore group. It told me I still had to adjust my new Razor scope so I did in the second group. I counted those cold bore shots in the dispersion test. Shown below.
I then shot the rest of the groups. Below are the stats. First is the Max Spread from Ballistic-X. 34-shots went 1.241 MOA.
I then used Ballistic-X to gather individual shot info. I had to find the center of the group so I could do a mean radius. I plugged all that into a spreadsheet. Below is the calculated Group center. The mean radius of all shots to Group center was calculated from this - .352 Inches.
Then I calculated the percentage of shots inside 1 MOA, shown in the transparent blue circle below. 75% of the shots were 1 MOA or less.
And the last image, which is really important to me, shows that dispersion was not random. In fact, there are two tightly packed sub-groups (red ellipses) in the whole mess. This tells me that it's not only about the rifle and ammo - IT includes ME!
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