Long Range Hunting Online Magazine


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

Reloading Techniques For Reloading


Reply

Ballistic Calculator instead of Chronograph

 
LinkBack Thread Tools Display Modes
  #22  
Old 07-07-2011, 11:36 PM
Gold Member
 
Join Date: Aug 2009
Posts: 693
Re: Ballistic Calculator instead of Chronograph

I thought those rails were to close, the front rail got blown by the blast, but I was told it should be close to the muzzle. Anyway I didn't believe readings chrono gave me. Sierra list H4831 SC with 59.2 grains going 3100 fps and I had 61 grain load... That should get at least 3160 fps but I would take 3100.
Reply With Quote
  #23  
Old 07-08-2011, 12:12 AM
Gold Member
 
Join Date: Jul 2010
Location: Mount vernon, OH
Posts: 669
Re: Ballistic Calculator instead of Chronograph

I've thought of sticking the chrono in front of my target, just gotta make sure I have a good zero so I don't shoot my chrono.
__________________



"Let glorious acts more glorious acts inspire,
And catch from breast to breast the noble fire!
On valour's side the odds of combat lie,
The brave live glorious, or lamented die;" - Iliad, Book V
Reply With Quote
  #24  
Old 07-08-2011, 08:12 AM
Platinum Member
 
Join Date: Jul 2004
Location: Texas
Posts: 5,373
Re: Ballistic Calculator instead of Chronograph

Quote:
Originally Posted by Jinx-) View Post
I thought those rails were to close, the front rail got blown by the blast, but I was told it should be close to the muzzle. Anyway I didn't believe readings chrono gave me. Sierra list H4831 SC with 59.2 grains going 3100 fps and I had 61 grain load... That should get at least 3160 fps but I would take 3100.

For the realy big rifles, a blast shield will help. I set the front screen 12 to 16 Feet from the muzzle.

And on your velocity, remember a lot of the velocity/Data in loading manuals is calculated with
optimum numbers and very little actual real world testing.

Also each barrel may give different velocities from the test barrel used depending on length
and bore quality.

One way to check the velocity of a hand load is to compare it with a factory load that list the
velocity on the box, It will probably be slower in your rifle because it was tested under the
best conditions. I have only seen one or two brands of ammo that reached the listed velocity
(Just barely). but it does give you a bench mark to start with and with good velocities you can
get good BCs for your bullets, Then your drop charts will be very dependable.

For load development using the chronograph I can rule out a load with just two shots (If
the SDs are way apart there is no reason to continue testing that load because it will not
be suitable for long range.

As you can tell I am a big proponent of the Chronograph because it can give you lots of
information and save you lots of money, Plus if you have one with a printer you have a
permanent record of all of your loads.

So don't give up on the chronograph.

J E CUSTOM
__________________
"PRESS ON"
Reply With Quote
  #25  
Old 07-08-2011, 09:00 AM
Platinum Member
 
Join Date: Oct 2009
Location: Thunder Basin, WY
Posts: 1,788
Re: Ballistic Calculator instead of Chronograph

Quote:
Originally Posted by Jinx-) View Post
Chronograph is a tool anyone working on load development should use, but what if you sighted in @ 100 then fire a group @ 300 and measure bullet drop, knowing bullet drop you can plug data in ballistic calculator and work your muzzle speed till you get same drop. Pocket ballistic calculator reduces stuff you need to carry on your range trip, then get everything setup and try not to loose or break things.
What do you think?
In my experiences, 300 isn't far enough to validate velocity by only using a program. We have to have a rifle that shoots basically "one hole" at 100 to know our TRUE zero, We also gotta know the exact height of our sights/scope before the ballistic program will be dead on at 300. I've often seen discrepancies at 300 from what the programs say, even with cronographed loads. I always concluded it was because of the close range "zero" not being exact.?

Now, that being said.....if we zero ~ 100, shoot at 300 and record drop, then shoot at 500 and record drop, then we can use the ballistic program to get close on velocity. It takes a big difference in BC to make much difference in drops when we're talking 500 and less, so the velocity is the biggest determining factor of difference in drop between 300 and 500 IMO.

As others have mentioned, a crono is a great tool to have. A cheap one may not give real reliable ES and SD's, but it will get you close on velocity at least.
__________________
Aim small = Miss small
SBruce

Reply With Quote
  #26  
Old 07-09-2011, 12:47 AM
Silver Member
 
Join Date: Aug 2008
Location: Colorado Springs
Posts: 230
Re: Ballistic Calculator instead of Chronograph

That's pretty funny if you were blowing the screens off. No way you are gonna get a good reading. Like was mentioned earlier stick that thing out 10+ feet and give it a go. Wonder if the chrony even still works. lol
__________________
Romans 12:12
www.projectsavage.com
Reply With Quote
  #27  
Old 07-09-2011, 01:28 AM
Gold Member
 
Join Date: Aug 2009
Posts: 693
Re: Ballistic Calculator instead of Chronograph

Yeah, the chrono was setup 2 - 3 feet from the muzzle, I tried to tell its to close, but since its not my, I let that guy set it up.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Ballistic Calculator instead of Chronograph
Thread Thread Starter Forum Replies Last Post
simple pda ballistic calculator? albertakid Rifles, Bullets, Barrels and Ballistics 6 08-08-2012 11:04 PM
strelok ballistic calculator chrishatley Long Range Hunting & Shooting 6 05-04-2012 10:03 PM
G7 ballistic calculator down? RangerBrad Long Range Hunting & Shooting 0 08-27-2011 12:30 PM
Ballistic calculator eric2381 Long Range Hunting & Shooting 28 10-20-2010 07:56 PM
Ballistic calculator elkfirst Long Range Hunting & Shooting 4 04-26-2006 01:18 PM

Current Poll
Do you plan to buy a new custom rifle in the next 12 months?
YES - Of course - 72.92%
1,648 Vote
NO - wife/girlfriend won't let me. - 27.08%
612 Votes
Total Votes: 2,260
You may not vote on this poll.

All times are GMT -5. The time now is 01:14 AM.


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