making an accurate cartridge..

mniesen89 · November 11, 2007, 07:22 PM

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?

steve4102 · November 11, 2007, 08:10 PM

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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

mniesen89 · November 11, 2007, 10:19 PM

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?

mrawesome22 · November 11, 2007, 10:21 PM

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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 · November 11, 2007, 10:24 PM

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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.

mniesen89 · November 11, 2007, 10:44 PM

obviously awesome....so there is a separate manual just for accuracy?

mrawesome22 · November 11, 2007, 10:58 PM

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.

steve4102 · November 12, 2007, 12:04 PM

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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.

mniesen89 · November 12, 2007, 04:05 PM

not in my lyman 48th edition its not steve

steve4102 · November 12, 2007, 06:09 PM

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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.

mniesen89 · November 12, 2007, 07:29 PM

that would be the 30-06 springfield.

Scorch · November 12, 2007, 07:55 PM

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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.

steve4102 · November 12, 2007, 11:16 PM

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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.

amamnn · November 13, 2007, 03:26 AM

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/

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?

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

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?

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?

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

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.