Long Range Hunting Online Magazine


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

Rifles, Bullets, Barrels & Ballistics Applied Ballistics


Reply

338 300gr BC

 
LinkBack Thread Tools Display Modes
  #1  
Old 10-01-2010, 05:09 AM
Silver Member
 
Join Date: Mar 2008
Location: Helena, AR
Posts: 277
338 300gr BC

Hey guys,
I am having a little difficulty in getting a ballistics program to match the drops I am getting with my 338 Allen. I have tested the velocity with two different chrongraphs (they both measure within 30 fps). The corrections with several different programs will be at least 1 MOA from what I actually have to use to hit the target. Any help is greatly appreciated as barrel life is very precious on this one. Thanks in advance.
Chris
Reply With Quote
  #2  
Old 10-01-2010, 10:03 AM
Silver Member
 
Join Date: Nov 2006
Posts: 190
Re: 338 300gr BC

Have you checked your scope to see if the adjustments are tracking correctly.
Reply With Quote
  #3  
Old 10-01-2010, 08:27 PM
Silver Member
 
Join Date: Mar 2008
Location: Helena, AR
Posts: 277
Re: 338 300gr BC

Yes, it has been awhile. It is a nightforce and I believe the clicks were just a little over the 0.25 moa that is stated (0.258).
Reply With Quote
  #4  
Old 10-01-2010, 08:57 PM
Silver Member
 
Join Date: Nov 2006
Posts: 190
Re: 338 300gr BC

What 300gr are you using, and what program.
Reply With Quote
  #5  
Old 10-01-2010, 09:14 PM
Platinum Member
 
Join Date: Jan 2008
Location: Falls Church, VA
Posts: 3,270
Re: 338 300gr BC

I have found with most software that the 'ideal' trajectory rarely matches reality. I use exbal and it has a trajectory validation function that helps to move 'ideal' to 'reality'
__________________
I'm not gonna shoot here. I'm gonna shoot waaaaaaaay over there!
Reply With Quote
  #6  
Old 10-01-2010, 11:12 PM
Platinum Member
 
Join Date: Nov 2003
Location: Washington State
Posts: 2,606
Re: 338 300gr BC

Quote:
Originally Posted by trebark View Post
I have found with most software that the 'ideal' trajectory rarely matches reality. I use exbal and it has a trajectory validation function that helps to move 'ideal' to 'reality'
yep...yep...doing this should get you squared away quickly regardless of what your chrono says. Don't get too hung up on what the chrono says...it's much more important, obviously, to hit what you're shooting at by matching the program to your actual trajectory. Might try using Bryan Litz's bc number (g1 or g7) for the 300g pill you're using. I'm shooting the 300SMK at 2980 and using his numbers for it, I haven't even had to do any trajectory validation, but I usually do with other loads/rifles. Good luck.
__________________
In the beginning God created the heavens and the earth. Genesis 1:1

"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God?" Thomas Jefferson - Notes on the State of Virginia

www.wildsidesystems.com - Shelter for Your WildSide - http://www.youtube.com/watch?v=tYwgo...&feature=g-upl
Reply With Quote
  #7  
Old 10-02-2010, 09:54 AM
Platinum Member
 
Join Date: Feb 2005
Location: USA
Posts: 2,598
Re: 338 300gr BC

Quote:
Originally Posted by canderson View Post
Hey guys,
I am having a little difficulty in getting a ballistics program to match the drops I am getting with my 338 Allen. I have tested the velocity with two different chrongraphs (they both measure within 30 fps). The corrections with several different programs will be at least 1 MOA from what I actually have to use to hit the target. Any help is greatly appreciated as barrel life is very precious on this one. Thanks in advance.
Chris


30 FPS off will cause a lot of problems. Use the trajectory validation feature on your ballistics program
__________________
range it,check the wind, dial in correction, aim and only one shot
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: 338 300gr BC
Thread Thread Starter Forum Replies Last Post
Wtt 300gr smk for 300gr br hybrid Franklin Reloading Equipment and Components 1 04-20-2011 03:45 PM
338 300gr SMK dakor Rifles, Bullets, Barrels & Ballistics 6 03-23-2011 08:24 PM
.338 300gr SMK BCID Reloading Equipment and Components 3 07-01-2010 05:26 PM
300gr smk dirtball Reloading Equipment and Components 1 07-20-2009 08:45 AM
WTB 338 cal 300gr SMK single action Reloading Equipment and Components 2 07-08-2009 05:54 AM


All times are GMT -5. The time now is 03:16 PM.


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