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Shot pellet trajectory calculator?

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Posted By Posted Date/Time
GN7777777 20-Aug-11 - 11:14 PM ET
Brian in Oregon 21-Aug-11 - 12:54 AM ET
hmb 21-Aug-11 - 06:18 AM ET
creek 21-Aug-11 - 06:44 AM ET
captin 21-Aug-11 - 07:00 AM ET
spitter 21-Aug-11 - 08:47 AM ET
GN7777777 21-Aug-11 - 08:49 AM ET
GN7777777 21-Aug-11 - 05:53 PM ET
hmb 21-Aug-11 - 06:03 PM ET
GN7777777 21-Aug-11 - 07:18 PM ET
hmb 21-Aug-11 - 07:42 PM ET
grunt 21-Aug-11 - 07:45 PM ET
GN7777777 21-Aug-11 - 08:49 PM ET
spitter 21-Aug-11 - 09:11 PM ET
goatskin 21-Aug-11 - 11:53 PM ET
Brian in Oregon 22-Aug-11 - 01:32 AM ET
GN7777777 22-Aug-11 - 08:03 AM ET
stokinpls 22-Aug-11 - 08:35 AM ET
dk 22-Aug-11 - 09:28 AM ET
dmarbell 22-Aug-11 - 10:06 AM ET
GN7777777 22-Aug-11 - 10:53 AM ET
GN7777777 22-Aug-11 - 02:32 PM ET
grunt 22-Aug-11 - 05:26 PM ET
spitter 22-Aug-11 - 05:36 PM ET
dmarbell 22-Aug-11 - 06:43 PM ET
GN7777777 22-Aug-11 - 06:52 PM ET
goatskin 22-Aug-11 - 07:30 PM ET
goatskin 22-Aug-11 - 08:08 PM ET


Subject: Shot pellet trajectory calculator?
From: GN7777777
Date: Sat, Aug 20, 2011 - 11:14 PM ET
Website Address:

I cant find an actual chart for this or a calculator- I know that the BC of a sphere changes dramatically depending on velocity.

We are trying to figure out the trajectory of 7.5 shot based on maximum range or elevation of from 24 to 30 degrees

This trajectory curve will allow us to see if a change in elevation or the building of a berm will be advantageous or practical to limit the maximum range of pellets

I cant find an online calculator or detailed chart

Can anyone help?

Regards from Iowa

Gene

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Subject: Shot pellet trajectory calculator?
From: Brian in Oregon
Date: Sun, Aug 21, 2011 - 12:54 AM ET
Website Address:

I've been trying to find such info for shot up to buckshot sizes for hunting purposes, to no avail.

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Subject: Shot pellet trajectory calculator?
From: hmb
Date: Sun, Aug 21, 2011 - 06:18 AM ET
Website Address:

What goes up must come down. HMB

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Subject: Shot pellet trajectory calculator?
From: creek
Date: Sun, Aug 21, 2011 - 06:44 AM ET
Website Address: http://www.shotgunsportsmagazine.com/downloads/shotgun_statistics.pdf

Here is a rather rough chart, but I think accurate for your purpose. John Radtke (CREEK)

http://www.shotgunsportsmagazine.com/downloads/shotgun_statistics.pdf

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Subject: Shot pellet trajectory calculator?
From: captin
Date: Sun, Aug 21, 2011 - 07:00 AM ET
Website Address:

Thanks for asking for that gene,,,,,and creek,,,,that is something I have also been looking for for a long time and never been able to find,,kinda thought it may not be something anyone had ever cared to find out..

Gona be very helpful to me on something I plan on doing.

captin

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Subject: Shot pellet trajectory calculator?
From: spitter
Date: Sun, Aug 21, 2011 - 08:47 AM ET
Website Address:

Contact SAAMI - Sporting Arms and Manufacturers Institute in Newtown CT... affiliated with the NSSF.

Their computer models can answer your questions...

Jay Spitz

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Subject: Shot pellet trajectory calculator?
From: GN7777777
Date: Sun, Aug 21, 2011 - 08:49 AM ET
Website Address:

I have tried a couple of ballistic simulators but there are several things wrong with them

First the problem with round shot is that the shot changes ballistic coefficent significantly

Bullets change also but it is not very significant

Second there is no provision for maximum elevation projections

Gene

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Subject: Shot pellet trajectory calculator?
From: GN7777777
Date: Sun, Aug 21, 2011 - 05:53 PM ET
Website Address:

It isnt only the max distance it is the actual trajectory

We might be able to build up a berm to intersect the trajectory- thus shortening the max distance

Gene

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Subject: Shot pellet trajectory calculator?
From: hmb
Date: Sun, Aug 21, 2011 - 06:03 PM ET
Website Address:

Mission impossible. HMB

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Subject: Shot pellet trajectory calculator?
From: GN7777777
Date: Sun, Aug 21, 2011 - 07:18 PM ET
Website Address:

We only need to shorten the max distance maybe 20 yards so it is far from impossible

Gene

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Subject: Shot pellet trajectory calculator?
From: hmb
Date: Sun, Aug 21, 2011 - 07:42 PM ET
Website Address:

You will be at the mercy of the wind, which will change the height of the targets and the distance the shot travels. HMB

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Subject: Shot pellet trajectory calculator?
From: grunt
Date: Sun, Aug 21, 2011 - 07:45 PM ET
Website Address:

Our club is in the process of trying to figure out this very thing. We may need to build a berm to prevent shot from reaching the water. The height is the question that needs to be answered. Shot screens are expensive and the poles would need to be a special length.

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Subject: Shot pellet trajectory calculator?
From: GN7777777
Date: Sun, Aug 21, 2011 - 08:49 PM ET
Website Address:

HMB the wind is a factor but only a factor- again you can have a safety margin

Its not magic

Gene

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Subject: Shot pellet trajectory calculator?
From: spitter
Date: Sun, Aug 21, 2011 - 09:11 PM ET
Website Address:

My question is why an elevation of 24-30 degrees?! From 16 yards, with a gun mounted at shoulder height of approximately 4' at a target height maximum of 17'4" out at 31 yards from the traphouse, gives us a rise of 13'4" over a run of 46 yards (16+31).

Breaking that down further we have 160"/1656" or less than 10%... shooting handicap will only lessen the rise over the run. A shorter shooter would increase the trajectory angle and a taller shooter would flatten the angle further.

Respectfully offered,

Jay

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Subject: Shot pellet trajectory calculator?
From: goatskin
Date: Sun, Aug 21, 2011 - 11:53 PM ET
Website Address:

Gene, if you'll look at that SSports data-sheet: the fps v. drop tables, I think you can back-figure pretty good.

They're showing 225yd max drop for #7½ fired at 30º, but no velocity and no elevation above ground, so their distance-data has to be ±.

Shot drops pretty fast once the velocity bleeds off. If you wanted to plot a smooth curve between their published 10+" drop at 60yds, and out-of-gas at 225yds, falling below a 30º hypotenuse, I'd bet a 15' berm at 180-190yds would catch 95% + of 30º shots, and 100% of anything under 30º.

IIRC, those carpeted berms at Loreto are 12m and the top is 120m from the firing line, and you have a couple of steeper angles at UIT trap, not to mention skeet.

Bob

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Subject: Shot pellet trajectory calculator?
From: Brian in Oregon
Date: Mon, Aug 22, 2011 - 01:32 AM ET
Website Address:

We have a ten foot berm wall around the far perimeter of my trap club. The purpose was mainly for noise abatement. I did some measurements via Google Earth, and the closest portion of the berm wall to a 16 yard shot from station one on a hard right from a trap oriented in that direction is 202 yards. My club restricts shot to 7.5 max., trap loads only.

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Subject: Shot pellet trajectory calculator?
From: GN7777777
Date: Mon, Aug 22, 2011 - 08:03 AM ET
Website Address:

So does anyone have pull with one of the shotshell companies? I would bet they can do these calculation (plus throw in wind factors) at a drop of a hat

Good comments and appears others are looking for this data

Gene

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Subject: Shot pellet trajectory calculator?
From: stokinpls
Date: Mon, Aug 22, 2011 - 08:35 AM ET
Website Address:

When you're finished, divide the yardage by .777 for a safety margin. ;-)

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Subject: Shot pellet trajectory calculator?
From: dk
Date: Mon, Aug 22, 2011 - 09:28 AM ET
Website Address:

While we are at this. Does anyone have any idea how far the lead will ricochet off of the targets at 90 degrees? DK

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Subject: Shot pellet trajectory calculator?
From: dmarbell
Date: Mon, Aug 22, 2011 - 10:06 AM ET
Website Address:

Gene,

This is an exercise in math only, nothing else for me. If you look at the bottom left hand chart in the link above, with 7.5 shot the max range for 30 degrees is about 210 yards. The intersection of the curve at 200 yards is a good reference point. It measures about 25-30% of the total height of the 30 degree elevation line. The tangent of 7.5 degrees (25% of 30 degrees) is 0.13165. So the berm would need to be 79 feet high at that point.

This calculation is only as accurate as the chart is, and roughly measured at that.

The chart seems to be well constructed, at least. If you've ever been "rained on" by bird shot, it seems to be coming almost straight down. That makes the problem of shortening the drop zone harder.

Danny

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Subject: Shot pellet trajectory calculator?
From: GN7777777
Date: Mon, Aug 22, 2011 - 10:53 AM ET
Website Address:

Danny- I dont think that chart is well constucted- it does seem to indicate that the max range for 7.5 shot though is 207 yards or so

Velocity is not factored in either- here we would be dealing with target loads

Usually when one is rained on by birdshot- the gun was pointed close to straight up or at a high angle upwards

To achieve the maximum shot range though it has to be pointed at about 30 degrees

True though that at the end of the arc there will be curve- but in this case- as apparently in the case of the trap club that uses carpet at 120 yards- we are not wanting to mitigate a great distance

Gene

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Subject: Shot pellet trajectory calculator?
From: GN7777777
Date: Mon, Aug 22, 2011 - 02:32 PM ET
Website Address:

I have sent him and email and will share if information is relevant

Regards from Iowa

Gene

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Subject: Shot pellet trajectory calculator?
From: grunt
Date: Mon, Aug 22, 2011 - 05:26 PM ET
Website Address:

Wobble trap with high targets are something we have to deal with.

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Subject: Shot pellet trajectory calculator?
From: spitter
Date: Mon, Aug 22, 2011 - 05:36 PM ET
Website Address:

Journee's equation stipulates a maximum range for 7-1/2 lead to be 209 yards.

Jay

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Subject: Shot pellet trajectory calculator?
From: dmarbell
Date: Mon, Aug 22, 2011 - 06:43 PM ET
Website Address:

Gene,

At 120 yards, the 30 degree angle produces a height of 69.28 yards, or 207.8 feet. Shot drop at 60 yards is only about 11 inches, according to the chart. Even if the shot dropped 29 yards in the next 60 yards (out to 120 yards), the curtain would need to be 40 yards high. Does the club you are talking about hang a carpet 120 feet high?

I think what is missing is that the angle from a shotgun mounted to the shoulder at 4.5 to 5.0 feet above the ground to the breakpoint on 16-yard targets would rarely be above 10 degrees. In fact, if you watch Harlan's DVD, he starts with a gun parallel to the ground and pushes into the target. I'd bet his angle doesn't get above 7 degrees.

Danny

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Subject: Shot pellet trajectory calculator?
From: GN7777777
Date: Mon, Aug 22, 2011 - 06:52 PM ET
Website Address:

I am not the one that mentioned the carpet on the berm but that is mentioned above by someone else

We are probably looking at how high would it have to be at like 180 yards

Gene

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Subject: Shot pellet trajectory calculator?
From: goatskin
Date: Mon, Aug 22, 2011 - 07:30 PM ET
Website Address: http://video.google.com/videoplay?docid=6857434015702395516

I had the name wrong: it is Lonato, but the dims are correct.

Mash the link.

Bob

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Subject: Shot pellet trajectory calculator?
From: goatskin
Date: Mon, Aug 22, 2011 - 08:08 PM ET
Website Address:

We are probably looking at how high would it have to be at like 180 yards.

Gene, how high can you conveniently build it (meaning a week-2 of a couple of 12-15yd tractors and a D-6-ish Cat, and NOT having to do 'dam engineering' on it)?

Bob

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