HuntingNut
HuntingNut
   Login or Register
HomeCommunity ForumsPhoto AlbumsRegister
     
 

User Info

Welcome Anonymous


Membership:
Latest: barcoo59
New Today: 0
New Yesterday: 0
Overall: 12598

People Online:
Members: 0
Visitors: 46
BOT: 1
Total: 47
Who Is Where:
 Visitors:
01: Forums
02: Home
03: Forums
04: Forums
05: Photo Albums
06: Forums
07: Forums
08: Forums
09: Forums
10: Forums
11: Forums
12: Forums
13: Forums
14: Forums
15: Forums
16: Forums
17: Forums
18: Forums
19: Forums
20: Forums
21: Forums
22: Forums
23: Forums
24: Forums
25: Forums
26: Photo Albums
27: Forums
28: Photo Albums
29: Forums
30: Photo Albums
31: Forums
32: Forums
33: Forums
34: Photo Albums
35: Forums
36: Forums
37: Forums
38: Forums
39: Forums
40: Forums
41: Forums
42: Forums
43: Forums
44: Forums
45: Forums
46: Forums
  BOT:
01: Forums

Staff Online:

No staff members are online!
 

Coppermine Stats
Photo Albums
 Albums: 305
 Pictures: 2360
  · Views: 396440
  · Votes: 1309
  · Comments: 86
 

Support our Advertisers

rimfire question
Help / Support / How-to's / Discussion related to PointBlank Software and External Ballistics in general
Post new topic   Reply to topic   Printer Friendly Page    Forum Index » PointBlank Software

View previous topic :: View next topic  
Author Message
tlo7mm
Super Member
Super Member


Joined: Nov 15, 2010
Posts: 419
Location: Oregon

PostPosted: Thu Nov 20, 2014 5:08 am    Post subject: rimfire question Reply with quote

Has anyone attempted to use the software for rimfire cartridges? I understand this is primarily for hand loaders but i was only curious if anyone had used it to collect data on the factory ammo you purchase for your rimfires.

_________________
"If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun." ~ The Dalai Lama
Never ascribe to malice that which is adequately explained by incompetence. - Napoleon Bonaparte
The wisdom of man never yet contrived a system of taxation that would operate with perfect equality. - Andrew Jackson
Patriotism is supporting your country all the time, and your government when it deserves it. - Mark Twain
Back to top
View user's profile
Vince
Super Member
Super Member


Joined: May 25, 2005
Posts: 13567
Location: Brisbane AUSTRALIA

PostPosted: Thu Nov 20, 2014 5:58 pm    Post subject: Re: rimfire question Reply with quote

Can't say I have mate, but ranges are so short with the venerable rimfire, it is hardly worth the trouble of looking for trajectory data. Also, trying to get a BC for the little lead projectile would be extremely difficult.

My experience shows me that with modern high velocity .22 rimfire rounds, when zeroed at 50yards, they are five and one half inches low at 100 yards. You could use them for hunting beyond that range, but it would be very hard work.

Where PB would come in handy would be in recording your shots on the target so that you have a record of individual brands of ammo.

_________________
Cheers, Vince Cheers

Illegitimi non carborundum
(Never let the bastards grind you down)

Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God.

"Nulla Si Fa Senza Volonta."
(Without Commitment, Nothing Gets Done)


Last edited by Vince on Fri Nov 21, 2014 6:57 am; edited 2 times in total
Back to top
View user's profile AIM Address MSN Messenger Yahoo Messenger Photo Gallery
DallanC
Site Admin
Site Admin


Joined: Jan 18, 2005
Posts: 3194
Location: Utah

PostPosted: Thu Nov 20, 2014 10:32 pm    Post subject: Re: rimfire question Reply with quote

I don't personally for the reasons Vince stated. But knowing muzzle and X yard velocities it is easy to compute the BC of a bullet and from there, chart the trajectory with the muzzle velocity.

It might be worth it for my 17HMR which 100 yard shots are quite fun and easy.


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


Joined: Jul 27, 2008
Posts: 7469
Location: south island New Zealand

PostPosted: Fri Nov 21, 2014 12:04 am    Post subject: Re: rimfire question Reply with quote

Radar will be able to help..flick him a PM as he is shooting .22 out to 3-400yards.

_________________
You shot it You pluck it !
Them who eats the most duck eats the most feathers!
Back to top
View user's profile
tlo7mm
Super Member
Super Member


Joined: Nov 15, 2010
Posts: 419
Location: Oregon

PostPosted: Fri Nov 21, 2014 3:05 am    Post subject: Re: rimfire question Reply with quote

I was able to obtain some of the BC for factory ammo that I shoot, it was rather easy however there is a lot of factory ammo that I do shoot through my rimfires that I cannot seem to find the BC for. It really wasn't something I figured was often done I am just curious about the data. I will definitely hit Radar up because I am interested in learning a bit about long range shooting with .22. Thanks Dallan, Vince and Elvis.
Dallan, my mom has an old Remington Model 512 .22 that I have done some long range shooting with reasonable success but I do agree that the .17 hmr is probably better suited for this. I would be interested to chrony my .17 because it is a rather unique gun from what I can tell. I have never seen another although I know that someone out there must have one. It is a Taurus pump action.

_________________
"If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun." ~ The Dalai Lama
Never ascribe to malice that which is adequately explained by incompetence. - Napoleon Bonaparte
The wisdom of man never yet contrived a system of taxation that would operate with perfect equality. - Andrew Jackson
Patriotism is supporting your country all the time, and your government when it deserves it. - Mark Twain
Back to top
View user's profile
Vince
Super Member
Super Member


Joined: May 25, 2005
Posts: 13567
Location: Brisbane AUSTRALIA

PostPosted: Fri Nov 21, 2014 7:03 am    Post subject: Re: rimfire question Reply with quote

I never thought of the .17 rimfire. When I hear "rimfire" I automatically think .22 . My shooting buddy has a CZ .17 rimfire and that thing is so accurate it is scary. He shoots extremely tight groups at 100m, I'm talking less than 5mm, so it would be interesting to see how it performs at longer ranges which I'm sure it will do very well.

_________________
Cheers, Vince Cheers

Illegitimi non carborundum
(Never let the bastards grind you down)

Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God.

"Nulla Si Fa Senza Volonta."
(Without Commitment, Nothing Gets Done)
Back to top
View user's profile AIM Address MSN Messenger Yahoo Messenger Photo Gallery
Elvis
Super Member
Super Member


Joined: Jul 27, 2008
Posts: 7469
Location: south island New Zealand

PostPosted: Fri Nov 21, 2014 8:38 pm    Post subject: Re: rimfire question Reply with quote

tlo7mm wrote:
. I would be interested to chrony my .17 because it is a rather unique gun from what I can tell. I have never seen another although I know that someone out there must have one. It is a Taurus pump action.
I thought they were in .45 long colt!!!!

_________________
You shot it You pluck it !
Them who eats the most duck eats the most feathers!
Back to top
View user's profile
tlo7mm
Super Member
Super Member


Joined: Nov 15, 2010
Posts: 419
Location: Oregon

PostPosted: Fri Nov 21, 2014 11:21 pm    Post subject: Re: rimfire question Reply with quote

They made the. 17 modeled after the old winchester 22 pump but when Taurus bought rossi they stopped making all of their Rifles except the. 45 lc until recently. They are now making AR type Rifles.

_________________
"If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun." ~ The Dalai Lama
Never ascribe to malice that which is adequately explained by incompetence. - Napoleon Bonaparte
The wisdom of man never yet contrived a system of taxation that would operate with perfect equality. - Andrew Jackson
Patriotism is supporting your country all the time, and your government when it deserves it. - Mark Twain
Back to top
View user's profile
MacD
Super Member
Super Member


Joined: Apr 08, 2011
Posts: 1052
Location: Canada

PostPosted: Sat Nov 22, 2014 7:28 am    Post subject: Re: rimfire question Reply with quote

Don't forget the. 22 WMR? I bought boxes of every 22lr and 22WMR I could find when I got my convertable revolver. I didn't shoot over a chronograph but recorded such things as groups, mis-fires and jams. I still have samples of each round and it would be interesting to shoot 5 of each over the chrony to get speed and deviation. From my tests it was readily apparent quality control for the 22lr varied widely from one maker to the next.

_________________
La a'Blair s'math n Cairdean
(Friends are good on the day of battle)
Back to top
View user's profile
PaulS
Super Member
Super Member


Joined: Feb 18, 2006
Posts: 3534
Location: South-Eastern Washington - the State

PostPosted: Sun Nov 30, 2014 11:18 am    Post subject: Re: rimfire question Reply with quote

I have used several ballistics software and spreadsheets to predict the trajectory of 22 LR ammunition. I have chronographed several hundred rounds and with all this I can tell you that the velocity on the box is nothing more than an estimate and any round that states velocity at or above 1200 fps will not match any ballistic profile. I have a list of 22 bullets and their ballistic coefficients and they range from .130 to .085.
My testing was done at 20, 25, 40, 50, 60, 75 and 80 yards.
The reason that "standard", "high" and "hyper-velocity" 22 LR ammo won't match any ballistic softare is that between 40 and 60 yards it goes through the transonic velocity region and that completely destabilizes the flight of the bullet. At transonic speeds (about 80 -110% of the speed of sound) the 22 begins to "cone" in flight - spiraling out of the line of flight before once again settling down on an entirely new trajectory path.

The subsonic ammo is much better in maintaining a pure trajectory and will fit a G1 ballistic prediction almost perfectly as long as the temperature is high enough to keep the ammo below the speed of sound (local speed of sound). The denser the air the lower the speed of sound so those of us who live above sea level, with humidity that is moderate to high have the ability to shoot faster 22s without going through the transonic range but even with the lowest density air if your ammo starts out at 1200 fps you are going to find a specific range, beyond which the ammo just doesn't group. You will also note the "change in trajectory" caused by the coning of the bullet when it aproaches the speed of sound.

The problem is worse for bullets with center of gravities towards the heal of the bullet because in the transonic period the center of pressure moves forward on the bullet. The center of gravity wants to move ahead of the pressure, "flip around backwards", but it is spinning so, much like a top that is winding down it begins to wobble and that wobble is in a circular movement that takes the bullet off its course. When it drops through the speed of sound the bullet will restabilize on some course that is unpredictable. (at least by any software I have seen or used)

_________________
Paul
__________________
Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
So and So's pages on the internet = NOT reliable loading data
Always check data against manuals
NEVER exceed maximum listed loads
Back to top
View user's profile Send e-mail
Display posts from previous:   
Post new topic   Reply to topic   Printer Friendly Page    Forum Index » PointBlank Software
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


Advertisements
 


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 :.