The Firing Line Forums

Go Back   The Firing Line Forums > The Skunkworks > Handloading, Reloading, and Bullet Casting

Reply
 
Thread Tools
Old November 11, 2007, 07:22 PM   #1
mniesen89
Senior Member
 
Join Date: October 21, 2007
Location: deland,fl
Posts: 238
making an accurate cartridge..

what makes the round accurate? Is it the OAL length of the round or is it the brass length? Or maybe something I dont know?
mniesen89 is offline  
Old November 11, 2007, 08:10 PM   #2
steve4102
Senior Member
 
Join Date: December 23, 2005
Location: Minnesota
Posts: 2,184
Quote:
what makes the round accurate?
A whole bunch of stuff. Bullet design, bullet weight, powder, brass, headspace, runout, OAL etc., etc. What makes a round accurate is when all of these things come together and the bullet exits the barrel at he optimal point in the harmonic wave of the barrel. Think of barrel harmonics as a wave. The high and low points in the wave will produce the best accuracy. Maybe this will help explain it better.
http://www.browning.com/faq/detail.asp?ID=108
steve4102 is offline  
Old November 11, 2007, 10:19 PM   #3
mniesen89
Senior Member
 
Join Date: October 21, 2007
Location: deland,fl
Posts: 238
I understand the components of it all, but my concern is,does the brass all have to be precisely the same length or is .02 off a big deal?
mniesen89 is offline  
Old November 11, 2007, 10:21 PM   #4
mrawesome22
Senior Member
 
Join Date: November 9, 2005
Location: Ohio, Appalachia's foothills.
Posts: 3,779
Quote:
A whole bunch of stuff.
Ditto. Many books have been written on the subject. Read one. I don't have time to write one here.
mrawesome22 is offline  
Old November 11, 2007, 10:24 PM   #5
mrawesome22
Senior Member
 
Join Date: November 9, 2005
Location: Ohio, Appalachia's foothills.
Posts: 3,779
Quote:
is .02 off a big deal?
A huge deal if your goal is ultimate accuracy. Uniformity is the goal for accurate loads.

I'm also assuming you mean .020". Hopefully not .020' or yards, or miles.
mrawesome22 is offline  
Old November 11, 2007, 10:44 PM   #6
mniesen89
Senior Member
 
Join Date: October 21, 2007
Location: deland,fl
Posts: 238
obviously awesome....so there is a separate manual just for accuracy?
mniesen89 is offline  
Old November 11, 2007, 10:58 PM   #7
mrawesome22
Senior Member
 
Join Date: November 9, 2005
Location: Ohio, Appalachia's foothills.
Posts: 3,779
Quote:
but my concern is,does the brass all have to be precisely the same length or is .02 off a big deal?
Let me put it this way. For benchrest accuracy, .020" is a big deal. But just one of many things that could be a big deal. Runout could be a big deal. Neck tension, case volume, flash hole size, case weight, OAL, case fill, ect. These are all important.

Anyway, case prep is everything when it comes to ultimate accuracy. So yes, .020" is a very big deal.
mrawesome22 is offline  
Old November 12, 2007, 12:04 PM   #8
steve4102
Senior Member
 
Join Date: December 23, 2005
Location: Minnesota
Posts: 2,184
Quote:
or is .02 off a big deal?
Considering that Max brass length is only .01 less than Trim to Length, I would say the having brass .02 off is a big deal. You either have some vary short brass or some very long brass. If your brass is to long (over Max length) then you need to trim it before you load it.
steve4102 is offline  
Old November 12, 2007, 04:05 PM   #9
mniesen89
Senior Member
 
Join Date: October 21, 2007
Location: deland,fl
Posts: 238
not in my lyman 48th edition its not steve
mniesen89 is offline  
Old November 12, 2007, 06:09 PM   #10
steve4102
Senior Member
 
Join Date: December 23, 2005
Location: Minnesota
Posts: 2,184
Quote:
not in my lyman 48th edition its not steve
What cartridge are you loading for? I have several manuals including the Lyman 48th. I would like to find out if we are comparing apples to apples here.
steve4102 is offline  
Old November 12, 2007, 07:29 PM   #11
mniesen89
Senior Member
 
Join Date: October 21, 2007
Location: deland,fl
Posts: 238
that would be the 30-06 springfield.
mniesen89 is offline  
Old November 12, 2007, 07:55 PM   #12
Scorch
Senior Member
 
Join Date: February 13, 2006
Location: Washington state
Posts: 11,435
Quote:
lyman 48th edition
I would recommend taking time to read all that stuff in the front of the manual. It deals with case prep (exactly what you are asking here), powder selection, bullet selection, actual reloading operations (sizing, priming, charging, bullet seating), and sources of variation. Once you have read it all, most of your questions will be answered.
__________________
Never try to educate someone who resists knowledge at all costs.
But what do I know?
Summit Arms Services
Taylor Machine
Scorch is offline  
Old November 12, 2007, 11:16 PM   #13
steve4102
Senior Member
 
Join Date: December 23, 2005
Location: Minnesota
Posts: 2,184
Quote:
that would be the 30-06 springfield.
OK, According to Lyman 48 the 30-06 has a MAX brass length of 2.494 and a Trim to Length of 2.484. That is a difference of .01 and your brass is off by as much as .02. Where in the Lyman 48 are you getting your measurements? These measurements above are found on page 220.

What are the measurements of your brass and what are you using to measure it? Brass that is over 2.494 can cause problems such as difficulty chambering and extremely high pressure. Not good for accuracy and safety.
steve4102 is offline  
Old November 13, 2007, 03:26 AM   #14
amamnn
Senior Member
 
Join Date: May 13, 2006
Location: WA, the left armpit of the USA
Posts: 1,323
We'll assume you've already covered the two more important accuray issues: the shooter and the rifle. Here are some places to start learning about loading for accuracy.

http://www.gunnersden.com/index.htm....-accuracy.html

http://www.6mmbr.com/index.html

http://www.benchrest.com/

http://www.sinclairintl.com/

http://www.precisionshooting.com/
__________________
"If the enemy is in range, so are you." - Infantry Journal
amamnn is offline  
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 09:15 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2014 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent: thefiringline.com
Contact Us
Page generated in 0.08722 seconds with 7 queries