Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels and Ballistics


Reply

Downrange Chrono vs Computer generated velocities

 
LinkBack Thread Tools Display Modes
  #1  
Old 10-14-2002, 06:03 PM
Platinum Member
 
Join Date: May 2001
Location: Sask. Canada
Posts: 2,410
Downrange Chrono vs Computer generated velocities

Here is an interesting list comparing my recent downrange Oehler velocities with the info from the latest Barnes reloading manual.
.308 Win. 45.5/Varget 26" Mike Rock Barrel
Yds Barnes Chrono'd
Mzl 2600 2608
100 2412 2428
200 2233 2209
300 2063 2050
400 1901 1919
500 1748 1763

The Barnes book provides a pretty good indication of downrange velocity if you don't have a chronograph and go to the bother of shooting through it downrange.
Reply With Quote
  #2  
Old 10-14-2002, 07:27 PM
PUBLISHER
 
Join Date: May 2001
Posts: 5,818
Re: Downrange Chrono vs Computer generated velocities

Ian

I think somewhere I got the idea that BC's actually vary depending on the stability of the bullet as it leaves the tip of the barrel. Therefor, a certain bullet design may exhibit different BC's in different rifles or with different load parameters in the same rifle. Have you any thoughts on this?
__________________


Long Range Hunting Rifles

Long Range Rifles, LLC - Ready To Ship

Components and assembly by LRH Sponsors
Reply With Quote
  #3  
Old 10-14-2002, 09:22 PM
Platinum Member
 
Join Date: May 2001
Location: Sask. Canada
Posts: 2,410
Re: Downrange Chrono vs Computer generated velocities

Len,
Velly intelesting... but I must admit to being a trigger-puller first and foremost and haven't got a clue about the theoretical stuff. That is why I hang out at your site, hopin' to learn some of that magic, eh! (a little Canadian content there)

Will leave the Ballistic Co-efficient stuff to the folks who enjoy or need it. I just want to make first shot hits, clang lots of steel and enjoy a bunch of shooting and hunting while we still can.

For some dumb reason I distrust the tables and computer generated figures. I prefer to shoot actual drops and get actual velocities. Sure like to have actual drop figures and charts for my hunting rifles.
Reply With Quote
  #4  
Old 10-14-2002, 10:13 PM
PUBLISHER
 
Join Date: May 2001
Posts: 5,818
Re: Downrange Chrono vs Computer generated velocities

I agree. I always rely on my own field-generated drop tables. I do however, rely on the "official" BC for guessing at wind drift.
__________________


Long Range Hunting Rifles

Long Range Rifles, LLC - Ready To Ship

Components and assembly by LRH Sponsors
Reply With Quote
  #5  
Old 10-14-2002, 11:35 PM
Platinum Member
 
Join Date: Dec 2001
Location: Mukilteo, WA
Posts: 1,091
Re: Downrange Chrono vs Computer generated velocities

Great info, Ian!

What elevation are you at? What was the temp that day? We "BC freaks" need to know the details....

[img]images/icons/grin.gif[/img]
Reply With Quote
  #6  
Old 10-15-2002, 09:00 AM
Platinum Member
 
Join Date: May 2001
Location: Sask. Canada
Posts: 2,410
Re: Downrange Chrono vs Computer generated velocities

We are at 1890 feet above sea level and the temp was in the mid 40's.

Load was .308 Win., 168 Barnes XLC, BC is .476 according to Barnes manual, 45.5 Varget in a BHA match case, Win. primer, O.L. was 2.83", 26" Mike Rock barrel.
Reply With Quote
  #7  
Old 10-15-2002, 09:40 AM
CAM CAM is offline
Silver Member
 
Join Date: Jan 2002
Location: Utah
Posts: 390
Re: Downrange Chrono vs Computer generated velocities

Very Very Interesting. I understand most of the BC stuff with the standard being. Sea level, temp 59 deg, BP 29.53, RH 78%. My question is this. The listed muzzle velocity will be the same at sea level as at 10,000 ft.? I do not have a chono at this time (on the wish list) so do I use the listed muzzle velocity and correct everything with the MAGIC B.C.
Keep up the good info and good luck to every one hunting. [img]images/icons/smile.gif[/img]
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Downrange Chrono vs Computer generated velocities
Thread Thread Starter Forum Replies Last Post
TAC 15 Crossbow Downrange Velocity - Chronographed? Len Backus PSE TAC 15/15i Crossbow Hunting Forum 12 03-13-2011 09:01 PM
Which mobile ballistic computer and software for my home computer? blipelt Equipment Discussions 0 10-28-2010 06:09 PM
wierd velocities, Load or chrono problem? 300remum Reloading 2 05-16-2010 11:51 PM
Downrange energy OldCane The Basics, Starting Out 9 12-22-2004 07:11 PM
300 ultra downrange trajectory question>> Huntaholic Rifles, Bullets, Barrels and Ballistics 1 03-07-2003 03:45 PM

Current Poll
I currently have hunting preference points in the following states

All times are GMT -5. The time now is 02:00 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC