HuntingNut
HuntingNut
   Login or Register
HomeCommunity ForumsPhoto AlbumsRegister
     
 

User Info

Welcome Anonymous


Membership:
Latest: ipigiepos
New Today: 0
New Yesterday: 0
Overall: 13125

People Online:
Members: 0
Visitors: 43
BOT: 1
Total: 44
Who Is Where:
 Visitors:
01: Home
02: News
03: Forums
04: Forums
05: Home
06: Photo Albums
07: Home
08: Forums
09: Home
10: Forums
11: Forums
12: Forums
13: Forums
14: Home
15: Forums
16: Home
17: Forums
18: Forums
19: Home
20: Photo Albums
21: Home
22: Forums
23: Forums
24: Home
25: Forums
26: Your Account
27: Home
28: Forums
29: Forums
30: Forums
31: Forums
32: Your Account
33: Forums
34: Forums
35: Forums
36: Photo Albums
37: Forums
38: Home
39: Home
40: Home
41: Home
42: Photo Albums
43: Forums
  BOT:
01: Home

Staff Online:

No staff members are online!
 

Coppermine Stats
Photo Albums
 Albums: 308
 Pictures: 2451
  · Views: 820622
  · Votes: 1316
  · Comments: 86
 

Point of Impact Prediction
Post your bug reports or feature requests here!

View previous topic :: View next topic  
Author Message
nico21s
Rookie Member
Rookie Member


Joined: Jun 16, 2011
Posts: 3

PostPosted: Tue Jan 08, 2013 12:59 pm    Post subject: Point of Impact Prediction Reply with quote

Hi Dallan,

Thanks for a wonderful program to calculate trajectories.
I carry my trajectory card in my pocket when out there.

I have a favourite load, optimised for hunting and accuracy in my rifle for bushy area.
I have another load, with a lighter faster bullet for plains.
The third load I have is a cheap bullet for shooting club shoots and not using expensive hunting bullets.

Is it possible to predict the point of impact of the lighter and match bullet when the rifle is zeroed using the hunting load?
Basically if the rifle is zeroed at 100m with the hunting load, the lighter load would be shooting higher/lower at 100m and will be at zero at a different distance. The same holds for the match bullet.

I can model the trajectory of each load based on a specific zero. The option is to shoot the different loads and by trial & error determine the point of impact and zero range for the other bullets. It would however be handy if one could get an estimate of impact to make life simpler and save the ammo for the actual shooting.

Do not know if this is a ridiculous idea... but that is what computers are for.

Thanks
Nico
Back to top
View user's profile
Elvis
Super Member
Super Member


Joined: Jul 27, 2008
Posts: 9232
Location: south island New Zealand

PostPosted: Tue Jan 08, 2013 1:05 pm    Post subject: Re: Point of Impact Prediction Reply with quote

welcome aboard nico21s
I use different loads through my rifles and I believe the easy way to get what you want is to sight in your main load then fire a group from your other two loads to find thier POI at 100 yrds or better still chronagraph them. the POI should enable you to use the system to give you your trajectory by putting in your data and keep changing your sighted in range untill you get the bullet path to intersect at 100yrds at the same height as your group. then you will have the correct path plotted??

_________________
You shot it You pluck it !
Them who eats the most duck eats the most feathers!
Back to top
View user's profile
Elvis
Super Member
Super Member


Joined: Jul 27, 2008
Posts: 9232
Location: south island New Zealand

PostPosted: Tue Jan 08, 2013 1:11 pm    Post subject: Re: Point of Impact Prediction Reply with quote

using the different ballistic coefficent in the data if all else is the same MAY give you the desired result but I believe you will still need to poke holes in paper to check. and with a lighter load you would be very very lucky not to need it.
my .270 has a nice accurate 130grn load and a 170 grn load for in the scrub, both pattern together at 100yrds so its not a big deal at all. I guess it is a matter of what range you are talking about as up to 100-150yrds on body shots for deer it shouldnt make a huge difference but if you are talking longer range or smaller target well I think you wont beat poking holes in paper.

_________________
You shot it You pluck it !
Them who eats the most duck eats the most feathers!
Back to top
View user's profile
nico21s
Rookie Member
Rookie Member


Joined: Jun 16, 2011
Posts: 3

PostPosted: Tue Jan 08, 2013 1:15 pm    Post subject: Re: Point of Impact Prediction Reply with quote

Hi Elvis,

You mention exactly the way I intend to do it with the current setup.
I just need to chronograph the match load to get the trajectory accurately plotted on Point Blank.

Good excuse to get to the range... Smile
Back to top
View user's profile
Pumpkinslinger
Super Member
Super Member


Joined: Sep 22, 2007
Posts: 5000
Location: NC foothills

PostPosted: Tue Jan 08, 2013 9:10 pm    Post subject: Re: Point of Impact Prediction Reply with quote

You could compare trajectories but the only way to compare points if impact is to shoot them. There isn't much way to calculate the barrel vibrations, etc. that would affect POI.

_________________
Mike

"I ain't no better than anybody else, and there ain't nobody better than me!" Ma Kettle
Back to top
View user's profile AIM Address Yahoo Messenger Photo Gallery
DallanC
Site Admin
Site Admin


Joined: Jan 18, 2005
Posts: 3570
Location: Utah

PostPosted: Tue Jan 08, 2013 10:42 pm    Post subject: Re: Point of Impact Prediction Reply with quote

Pumpkinslinger wrote:
You could compare trajectories but the only way to compare points if impact is to shoot them. There isn't much way to calculate the barrel vibrations, etc. that would affect POI.

IMO this is what I've found in the field. You can sight in for one type of ammo, then shoot test groups with other types of ammo. Record the MOA shift from your primary load to the secondary types then just adjust your scope to the new types.


-DallanC
Back to top
View user's profile Photo Gallery
TRBLSHTR
Super Member
Super Member


Joined: Mar 23, 2007
Posts: 1071
Location: Lower 48's-left coast(near portlandia)

PostPosted: Wed Jan 09, 2013 12:07 am    Post subject: Re: Point of Impact Prediction Reply with quote

Very Happy I do like Dallan says-plus tape a"doping card" to the stock on my rifles to kinda take out the guesswork!

_________________
"Tolerance becomes a crime when applied to evil." Thomas Mann
Back to top
View user's profile
Aloysius
Super Member
Super Member


Joined: Nov 03, 2009
Posts: 2435
Location: B., Belgium

PostPosted: Wed Jan 09, 2013 2:53 am    Post subject: Re: Point of Impact Prediction Reply with quote

And then don't make mistakes: sometimes "UP" means cross goes up, sometimes "UP" means POI goes up.
And the same things can happen with "L" and/or "R"...
remember: your right hand is where your tumb is pointing left. Smile
Back to top
View user's profile
Display posts from previous:   
Post new topic   Reply to topic   Printer Friendly Page    Forum Index » Bug Reports / Feature Requests
Page 1 of 1
All times are GMT - 7 Hours



Jump to:  


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Valid CSS! Valid HTML 4.01!
Click to check if this page is realy HTML 4.01 compliant for speed :)

All logos and trademarks in this site are property of HuntingNut.com.
The comments are property of their posters, all the rest © 2011 by HuntingNut.com
Interactive software released under GNU GPL, Code Credits, Privacy Policy

.: Upgraded to DragonFly 9.2 by *Dizfunkshunal* :.