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Thoughts on fliers shooting groups.

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This N50 card had approximately 35 FPS of extreme spread. The state of tune and how it is achieved affects the vertical in surprising ways.

Too lean or too fat at a particular pressure will cause unnecessary vertical that will not align with what a ballistic calculator says should happen based on velocity. 

Just right… and fairly large spreads can still produce very tight vertical.

There is a lot more than just velocity that causes vertical. That’s a hard one for many to wrap their head around. 


Mike
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Mike,

Would you explain that a little more? This sounds very interesting.

And I really don't understand what the factors are that affect vertical dispersion — MV I understand, but what else is there...?

Thank you! 👍🏼

Matthias




 
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Beautiful

thomasair-agg.1629128175.jpg


thomasair-tgt.1629128185.jpg

 
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Cornpone/ Mike,

would you care to share* with us an intro to your target scoring program?



The option of overlaying targets is very cool — I want one! 😊

And not just getting mean radius put CEP at three different percentages, that's some powerful program you got there!! 👍🏼

Matthias



*Probably as a separate thread.
 
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Thanks.

I bought OnTarget probably 6-7 years ago and used it for about a week. I found I spent a whole lot more time analyzing and inputting data than I did shooting. It’s great software and does its job well, I just don’t personally have the time for it these days.

Once you have shot a number of BR cards and established an average…you know right away if you are on track, improving, or declining when you score your card. For practice I can score a card through the scope as I shoot, so I don’t have to spend time for the actual process. If I didn’t have ten pounds of crap to stuff into a 5 pound sack everyday…I would probably enjoy using OnTarget. :)

Mike 
 
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"This N50 card had approximately 35 FPS of extreme spread."

What does this mean? Thank you in advance.
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This means that through the course of firing this entire target, there was an extreme spread in velocity of about 35 feet per second from Hi to Low shot speed. That is actually quite a huge amount for a target that looks like that. While the barrel vibrates and the "bullet", I say bullet because its a projectile that could be a pellet or a slug, leaves at different vibrations remember those vibrations are mostly caused by the hammer strike and Valve opening and closing so, If velocity shot to shot changes then time of flight within the barrel changes, and thus the location of the barrel in its vibration changes. The ultimate is to have a barrel that vibrates the exact same every time and an extreme spread of velocity that is very small, like 2-3 feet per second. meaning the bullet leaves the barrel in the same place. What that "On Target" Diagram doesn't show is outside forces on the "bullet". So Mikes target as good as it is could have many different aiming points based on flags etc. The "On Target" diagram with is intended to show barrel vibration location really only shows "bullet" strike location.
 
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It has always amazed me how much a small directional wind shift can change point of impact. I am talking only directional change where wind velocity stays constant. When you consider that during a group we are likely encountering velocity and direction change together....sometimes you say bad words when the "unexplained" flier goes for a ride.
 
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