Very interesting.

 

"see through" target is 24 x 32 inches

Not sure what I'm looking at here and am unfamiliar with the term. Please enlighten me.

 

The match I participate in has a steel target that measures 24 x 32 inches,

I made this "see through" target to practice shooting at this target and being able to see where my bullets would have hit the real target.

The red dots are the impact points for the 25 shots.

 

Damnnnnn and I’ve got my hands full trying to become proficient at 8” and 6” at 300 yards.

Your skill set is really impressive.

 

Here is a link to the youtube video. About 3 1/2 minutes long.

Range Video



I tested the Norma Xtreme at 300 yards in April of this year.

This is 15 shots at 300 yards. Notice the temperature is in the 50's and the average MV is 1153 fps. The average MV seems to track closely with the temperature increasing about 1 fps for each degree rise in temperature with the Norma Xtreme.

The target is an 8 x 8 inch square. I deliberately set my sights to hit to the left of the target so I could see the impact points and get an idea of the group size.

I prefer this method over a paper target. I videotape the shooting session. Then using video editing software and phototshop can create an image like this. I like this because I can match each shot in the video to the output of my Garmin chronograph.

When shooting long range like this the major contributing factors are the variations (standard deviation) of the MV and BC. Ballistics Coefficients vary from shot to shot just like muzzle velocities do.

The precision of the shooter and equipment are not nearly as much of a factor at long range than at short ranges.

For example, if at 300 yards the vertical spread is 8 inches just due to variations in MV and BC and the shooter and his equipment, are capable of 1 MOA that would increase the vertical spread to 8.06 inches.

If the shooter/rifle are capable of 2 MOA the vertical spread would grow to 8.25 inches.

For long range with the 22l LR the important factors are low SD's of MV and BC. A higher MV and BC both reduce vertical spreads at long range. Higher MV does increase the horizontal spread due to variations in wind speed but the lower vertical spread more than makes up for it.

I have degrees in math and physics and have had an interest in external ballistics all my life, I'm 79 years old.

I like to do field studies to see if the actual performance at the range matches what the theoretical data from ballistics solvers produce. I have found a strong correlation.

I have found that higher the quality (more expensive) ammunition overall produces better results.

However, it's easy for the ammunition manufacturers to increase the price so the only way to find the best performing ammunition for long range shooting is to test it at long range. Testing it at 50 or 100 yards is a waste of money and time. A round that will produce "bug hole" groups at 50 yards will not necessary perform well at long range which for me is 250 yards or beyond. Those small groups suggest the shooter and his equipment are performing well but as I've discussed above that is not much of a factor at long range.

 

Excellent work, congratulations

JH

 

I'm unclear on what equipment you are using, spotting scope, target camera? etc. Thanks for posting this, I am really intrigued to set up for 300 yards. Thanks Dave

 

I am using a Sony HDR-CX220 video camera which has a 32 power optical zoom which has Carl Zeiss lenses.

With that camera comes editing software called Playmemories Home which can be downloaded to my laptop if the camera is connected to it and then pulled up when needed.

To produce the image with the impact points I use paint.Net which is a free photo editing program which is a simplified version of Photoshop.

I set my sights so the bullets don't impact the steel target but rather strike near the target in an area where the impacts are easy to see and video tape the impacts with the camera.

Then the Playmemories can be used to "edit" the video and remove the time between each shot. This makes it easier to produce the final image with the impact points but is not required.


Still using Playmemories and the editing portion and the shortened version of the impact points video I have created I first make a screen shot of the target area for the background for the image with the bullet impact.

Then using Paint.net I create an image of that background image. I then create two layers above that background image, the first is the layer where each impact point is located labeled “impacts” . The layer above that is where the image of each shot is pasted from Playmemories labeled “shots”.

Using Playmemories video editing I let the video run until I hear the shot fired and then see the impact point and stop the video at that point. The video can then be advanced or backed up frame by frame at intervals of 1/100th of a second. I freeze it at the first frame where the impact can be seen. I then make a screen shot of the computers screen.

Then going over to paint.net I paste that image in the “shots” layer. Then select the “impacts” layer below the “shots” layer. Then using the “Paintbrush” tool in paint.net I put a small dot on the impact point in the “shots” lay but the dot doesn’t appear the “shots” layer but rather In the “impacts” layer.

To see the impact in the “impacts” layer the “shots” layer must be made transparent.

I repeat this process with each shot.

When all the shots have been created in the “impacts” layer I make the “shots” layer transparent and then “flatten” the image into a single layer.

 

Wow that's awesome and way over my head,whats a good spotting scope for long distance? Any recommendations? Thanks Dave

 

The posting had been accidentally posted before I was done with it. It is now complete.

griecke

 

Very impressive, a lot of effort and thanks for sharing this, very meaningful and valuable to us laymen,Dave