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Groups size and distance


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#21 Miculek is a Noob

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Posted 03 February 2016 - 07:43 AM

If you go by a single spread. than the group size (radius or diameter) increases directly with distance. If you go from 1 inch at 20 yards then it will be 2 inch at 40 yards at 4 in at 80 yards. The area of the group increases with the square of distance. Basically to first approx sprewell and bus are correct.

 

.... assuming identical muzzle velocity, projectile weight, and ballistic characteristics on every shot. Which never happens.



#22 peterthefish

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Posted 03 February 2016 - 08:30 AM

.... assuming identical muzzle velocity, projectile weight, and ballistic characteristics on every shot. Which never happens.

If you assume that the first, closer group, has those variables following a given distribution, which is also applicable to the further group, then it should translate. At pistol ranges < 50 yards there should not be anything other than a linear increase in group size with distance from a mechanical perspective.

The problem is aiming at a consistent reference point on a given target at 10 yards is easier than consistently aiming at the same reference point at 30 yards.

#23 ron169

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Posted 03 February 2016 - 09:45 AM

Set target at 10 yards, set another in line at 50. Shoot from solid rest. Wouldn't be perfect due to minute differences between shooting positions but it might tell you something
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#24 GuanoLoco

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Posted 03 February 2016 - 05:06 PM

Might tell you how much punching through cardboard influences pistol bullet paths over 40 yards. Probably not mch.
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#25 Sprewell

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Posted 03 February 2016 - 05:39 PM

The problem is aiming at a consistent reference point on a given target at 10 yards is easier than consistently aiming at the same reference point at 30 yards.

 

Because of stupid?



#26 peterthefish

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Posted 03 February 2016 - 07:01 PM

Because of stupid?


Because at 10 yards you can see the A Zone perf well enough to aim for the center. At 30 not so much.

#27 GuanoLoco

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Posted 04 February 2016 - 12:26 AM

There's a perf?
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#28 Miculek is a Noob

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Posted 04 February 2016 - 08:04 AM

Not once you get past 11 yards.



#29 Sprewell

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Posted 04 February 2016 - 08:10 AM

Someday the technology will exist to create various sizes of circles on a sheet of paper.



#30 J.A.Nine

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Posted 04 February 2016 - 08:13 AM

Because at 10 yards you can see the A Zone perf well enough to aim for the center. At 30 not so much.

 

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#31 peterthefish

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Posted 04 February 2016 - 09:02 AM

Someday the technology will exist to create various sizes of circles on a sheet of paper.

Most people don't use a 1" dot at 10 yards and a 2" dot at 20. I posit if they did they might find their groups grow more linearly rather than exponentially.

I've got 20/20 vision (lasik) and I can't see the perf much beyond 15 yards, which makes it hard to aim at a consistent place.

Fuck you all.

#32 Miculek is a Noob

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Posted 04 February 2016 - 02:12 PM

I've got 20/20 vision (lasik) and I can't see the perf much beyond 20 yards, which makes it hard to aim at a consistent place.

Fuck you all.


Fucking cheater. 4.2.2
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#33 GuanoLoco

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Posted 04 February 2016 - 04:11 PM

I think we should bump him to Open for using Optics in his eyes.
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#34 Miculek is a Noob

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Posted 04 February 2016 - 07:57 PM

It's one of the dumbest rules in the book. So if they order 40 cases of targets for Nationals and they show up with nice sharp perf lines because the dies were just replaced, they're supposed to cancel the match?



#35 peterthefish

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Posted 04 February 2016 - 08:33 PM

I did not know that was an actual rule. I had to look it up.

#36 GuanoLoco

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Posted 04 February 2016 - 10:57 PM

4.2.2 Paper targets must have scoring lines and non-scoring borders clearly marked on the face of the target, however, scoring lines and non-scoring borders should not be visible beyond a distance of 33 feet. The scoring zones reward power in USPSA matches.

Huh
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#37 ZachJ

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Posted 04 February 2016 - 11:08 PM

That sounds like a dumb rule. I can see the perfs on a 25yd target on a sunny day at my club so..

Deliberate, then obliterate.™

 

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#38 GuanoLoco

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Posted 04 February 2016 - 11:16 PM

That sounds like a dumb rule. I can see the perfs on a 25yd target on a sunny day at my club so..


I think we should bump you to Open for excessively good distance vision.
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#39 ZachJ

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Posted 04 February 2016 - 11:53 PM

Am young, by the time I'm Open age, I'll probably have normal or worse vision. It's ok.


Deliberate, then obliterate.™

 

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#40 Miculek is a Noob

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Posted 05 February 2016 - 08:15 AM

Plus you can't shoot straight, so who cares what you see, right?






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