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OnTarget Precision Calculator v2.10

The OnTarget Precision Calculator gives the marksman a tool to accurately measure and analyze bullet hole groups in their targets. It provides measurements and information that is critical for evaluating ammunition accuracy and consistency.

The OnTarget Precision Calculator has a simple and intuitive user interface. You import images from your scanner or digital camera. Set the target distance, bullet hole size, and point-of-aim. Bullet holes are then positioned directly on top of the target graphic and information about the group is generated immediately.

Group information includes: Max Spread CTC(center-to-center), height and width, average distance to center, and group offset from point-of-aim. The calculations are based on the center of the bullet holes regardless of bullet caliber. Results are shown in either standard or metric measurements along with minutes of angle (MOA).

This is an image of the main screen. It shows the toolbars, target, and group information. Click the image to view it full size.

OnTarget project screenshot

To get started, download the program, read the online Quick Start Guide, and view the OnTarget Demo Video. You will be able to scan your target, define the groups, and save the results in just a few minutes.

Visit the History and OnTarget FAQ pages for more information on the program and to get answers to the most common questions regarding OnTarget programs.

OnTarget v2.10 Feature List:

  • Calculates: group center, maximum group spread (CTC), average distance to center, group width and height, and group offset from point of aim.
  • User selectable for standard or metric measurement display and data output. All measurements are displayed in selected units along with minutes of angle (MOA).
  • All project information, including the target graphic, is saved in the project file. Files can be shared between users without recalibration or adjustment.
  • Target project can be printed. All target information is shown on the printout.
  • OnTarget v2.10 can open .tgx file created by all previous versions of the program. Note: OnTarget v2.10 project files cannot be opened in the the free version of OnTarget v1.10.
  • Zoom commands include: graphical zoom, zoom in, zoom out, fit window, and zoom to selected group. Quick zoom-to-group command added, hold down and click in the group to zoom.
  • Bullet holes can be selected and edited directly. No need to start over with the group if you slightly misplace a hole.
  • Pre-defined values for common target distances and bullet hole sizes along with user defined custom values.
  • All settings carry over from one project to the next. No need to re-enter common setup information.
  • Integrated scanner support using Micrsoft's WIA (Windows Image Acquisition) system. (Future upgrades will include TWAIN support.)
  • Target image can be rotated in 90 degree increments to correct orientation.
  • Imports and saves popular graphic file types. (.jpg .bmp, .tif, .png)
  • User defined point-of-aim on target. Aim point is used to calculate group offset.
  • User selectable group text and notes displayed in Target View, in saved graphics, and on printed targets.
  • User selectable graphical elements for maximum spread, group extents, and average distance to center in Target View.
  • Graphical ruler for measuring distances in Target View. Correctly scaled regardless of zoom level or graphic source.
  • User selectable line thickness and color for the graphical elements of the group in the Target View.
  • Entry fields for project title, date, location, name, and project notes.
  • The average values for all groups in the project is calculated and displayed in the Target Info tab.
  • Easy to use "Set Reference" command for defining a known distance on the target for correct scaling of calculations.
  • Popup menu in Target View for frequently used commands.
  • Numerous hotkey combination for frequently used commands. (Go to the Help/Help Topics menu for more information.)
  • Oversized toolbars for easier use.


Measuring Group Size

There are several methods for measuring and calculating the size of a group of bullet holes in a target. These methods vary depending on the tools and equipment available but the goal is always the same; determine the center points of two or more holes in a target. Once you know the position of the center points the group information can be calculated very easily.

Traditional Methods
The two most common methods of measuring bullet hole groups involve the use of calipers. Both methods are used to calculate the maximum spread, or center-to-center distance, of the group. Let's take a quick look at each.

In the first method a standard set of calipers is used to measure the extreme distance to the outside edges of the holes in the group. Then several holes are measured and an average size calculated. Finally the average hole size is subtracted from the overall measurement resulting in the group center-to-center distance.

The second method of measurement uses a set of calipers modified to hold a pair of clear circlular templates along with an eyepiece for optical magnification. The operator looks through the eyepiece, aligns the two circles with the extreme holes of the group, and reads the center-to-center distance directly from the caliper.

Both of these methods produce very accurate results and with practice can be done rather quickly. The first method is more commonly used because it can be done with a standard set of calipers. The second method is used to certify groups because if its greater accuracy.

OnTarget Method
OnTarget uses the center of the bullet holes to calculate the group information. First an image of the target is imported. The desired bullet hole size is set along with the target distance, the point of aim, and the reference distance if needed.

The user zooms in on the bullet holes that will be added to the group, selects the hole input tool and clicks in the Target View. A circle drawn at the defined bullet hole size is displayed and moves with the mouse. The user positions the circle over a bullet hole and clicks the mouse button to anchor the hole. As each hole is entered the group information is calculated and displayed.

The use of the circle on the view of the target allows the user to accurately position the center point of the hole. Even if the bullet hole does not have a clean edge all the way around the circle can be positioned accurately.



Mail to: webmaster@ontargetshooting.com for more information about OnTarget.


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© 2007-2012 Jeffrey Block, OnTarget Software, Colorado USA