Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Techniques For Reloading


Reply

Chrono Question

 
LinkBack Thread Tools Display Modes
  #1  
Old 06-30-2011, 07:30 PM
Silver Member
 
Join Date: May 2011
Location: Idaho
Posts: 180
Chrono Question

I've been reloading for a little over 4 years now and have never shot thru a chrono until this week, in the past id just work up different loads until id find the most accurate load and never worried about how fast they shot, I purchased a Savage LRH 7mm a couple months ago and have found a couple loads that shoot great so I borrowed a friends chrono and was just going to use which ever load shot the fastest since they all group the same on paper, when I shot thru the chrono I had a variance of 300 fps between 9 shots of the same load, I measure out each load individually and know they are all the same, so I grabbed my AR15 and my bolt action 223 and shot them thru the chrono and only had a variance of 12fps between the 2 guns and I use the same process to load for all my guns, any ideas why my 7mm is so inconsistent
Reply With Quote
  #2  
Old 06-30-2011, 07:40 PM
Silver Member
 
Join Date: Feb 2011
Location: Prince George B.C.
Posts: 195
Re: Chrono Question

how close to the chronograph were you shooting? A 300 fps variance seems far too extreme to me to be consistant POI. If I had to guess I would say that the chrony was being affected by muzzle blast from the bigger gun to get that big of a difference. When shooting my bigger guns ( well big to me anyways) I have had the chrony out as far as 30 ft to get a proper reading on it. Hope this helps.
Reply With Quote
  #3  
Old 06-30-2011, 07:48 PM
Silver Member
 
Join Date: May 2011
Location: Idaho
Posts: 180
Re: Chrono Question

I had it about 2 feet in front of the barrel guess I had it to close ill have to try it out farther thanks
Reply With Quote
  #4  
Old 06-30-2011, 09:04 PM
Platinum Member
 
Join Date: Jan 2008
Location: West Central Idaho
Posts: 1,099
Re: Chrono Question

Quote:
Originally Posted by spdrman View Post
I had it about 2 feet in front of the barrel guess I had it to close ill have to try it out farther thanks
At least 10 feet with the 7mm and that's close. I have a permanent shooting bench and the mount for the chronograph is 16 feet from the bench.

There is a formula to compute the velocity loss from muzzle to chrono. At 16 feet with my velocitys I needed to add 9.6 fps
__________________
Jim



There is something about the outside of a horse that is good for the inside of a man. Sir Winston Churchill.

Everything that is really great and inspiring is created by the individual who can labor in freedom. Einstein
Reply With Quote
  #5  
Old 07-02-2011, 08:29 AM
Junior Member
 
Join Date: Jul 2010
Posts: 15
Re: Chrono Question

As said, definitely too close, that is even to close for the 223. I use 15 feet as my all around distance. Works for magnums on down and the add is consistent that way.
Reply With Quote
  #6  
Old 07-03-2011, 04:41 AM
Platinum Member
 
Join Date: Jan 2007
Location: PA
Posts: 1,073
Re: Chrono Question

If you are using a Chrony that folds in half, make sure both halves are level. If not, you will get erratic readings.
Reply With Quote
  #7  
Old 07-03-2011, 05:25 AM
Platinum Member
 
Join Date: Feb 2005
Location: Nevada
Posts: 2,782
Re: Chrono Question

Yup, you're problem is not a problem!

These are my personal distances that work for me:

None Magnums ------- 10 ft
Magnums without Muzzle brake--------12 ft
Magnums with Muzzle brake----------15 ft

When I set up my chronograph, before I shoot the big boys I run some
0.22 LR bullets through to make sure all is fine. My chronograph will read my 0.22's and the pellets from an air gun at any of those distances.

Good luck!
__________________
-----------------------------

-----------------------------
HEBREWS 13:8
Jesus Christ the same yesterday, and to day, and for ever.

Our Lord Jesus said that as it was in the days of Noah and
also as it was in the days of Lot so it shall be in the days...
It's happening again!!! God sent to us His prophet, and His Word
to this generation and we once more are rejecting it as was prophesied!!!

---> As promised, God Sent His Prophet to us!
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Chrono Question
Thread Thread Starter Forum Replies Last Post
Cheap Chrono question / suggestion TORCHRIDER Reloading 6 02-02-2011 10:55 AM
Anyone ever chrono 300 WSM? goodgrouper Rifles, Bullets, Barrels and Ballistics 13 01-22-2008 10:39 PM
Chrono Question Blacktail Reloading 1 08-11-2007 06:28 PM
Chrono Help Randy Dunn Rifles, Bullets, Barrels and Ballistics 4 03-06-2006 12:16 AM

Current Poll
Do you archery hunt for elk?
YES - 29.70%
49 Votes
NO - 55.15%
91 Votes
Not yet, but I plan to. - 15.15%
25 Votes
Total Votes: 165
You may not vote on this poll.

All times are GMT -5. The time now is 10:39 PM.


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