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Reloading Techniques For Reloading


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is it normal ???

 
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  #1  
Old 03-07-2013, 06:44 PM
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is it normal ???

Hi new to reloading , stupid question is I measure my 243 empty case and they all read 2.044 after shooting them. Later on I full length size them and they read 2.048. Stupid question is this normal
the book says 2.045 length is the standard ??. So I have to trim them down to standard right.. ? Am lost
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Old 03-07-2013, 07:06 PM
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Re: is it normal ???

Quote:
Originally Posted by Freedom2live View Post
Hi new to reloading , stupid question is I measure my 243 empty case and they all read 2.044 after shooting them. Later on I full length size them and they read 2.048. Stupid question is this normal
the book says 2.045 length is the standard ??. So I have to trim them down to standard right.. ? Am lost
You don,t have to trim as long as the neck chamber is longer.

I like to do a cerrosafe casting of the chamber unless I have the reamer that was used to chamber
it with.

Cerrosafe can be bought from Brownell's and re used many times. It can be melted with a hot air gun
or hot water.

After you cast the chamber you can measure the maximum neck length you can use. (It is
recommended that the case necks be .020 shorter than the neck chamber.

Another test is to take a the bullet that you use in your load and try to insert it in a fired case,
if it doesn't want to go the case necks are probably to long and must be trimmed .020 to .030 .

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  #3  
Old 03-07-2013, 07:30 PM
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Re: is it normal ???

another nice thing about a chamber casting is that you will know your true dimensions and if there is any taper in the throat area or end of the chamber you need to be aware of...
I haven't worked with cerro-safe myself(rem did cast a chamber for me that was trouble once though), but I should probably get some to be able to find those little issues you run into from time to time.

As to growth when you re-size, yes it is normal. I have one rifle that grows .020" the first firing, then it settles down(with the dies properly set) to .003" per firing. Most rifles will be less than my example.
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Old 03-07-2013, 07:53 PM
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Re: is it normal ???

Thanks guys very. Much .. It is normal for it to greater fulllenght sizing.. I thought I was seeing things
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Old 03-07-2013, 08:08 PM
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Re: is it normal ???

Have you considered what you are doing when you full length size?

You force the body of the die over the outside of the cartridge and the "slug" of the neck sizer through the neck (it goes in easy since the neck is expanded after firing). The body of the die compresses the diameter of the cartridge a little smaller, since it expanded to fill the chamber, particularly near the front. The top part of the die (the neck area) shrinks the neck of the cartridge smaller than the final diameter it needs to be.

Then when you raise the die, the slug passes through the inside of the neck from the bottom to the top, expanding it to the correct inside diameter to fit the bullet. The fact that you pull it through from the bottom to the top, is why the neck becomes longer (one of the reasons). The second reason is that if you fire high pressure loads, the brass will actually flow as if it was putty from the bottom to the top because of the effect of the high pressure/ velocity gases.

You would do well to trim all your brass exactly the same length. Then if you check the length after it is fired, you get a good feeling for the impact your loads have on it. The more lengthening you see, the shorter the life of the brass will be before you have to throw it away. If your head space is "loose" the bottom of the cartridge will also expand until it touches the bolt face and when you re-size it the part that stretched does not become thicker again. Next time you shoot it, it stretches again and gets thinner still. Only so much of this can go on before is ruptures and that will not be a good day for you....

So if you are shooting a bolt gun or a single shot, do NOT full length re-size. Just get a Lee collet type neck sizer and use it to shrink the neck only. Your brass should fit your chamber perfectly and if you do this it will last much longer.
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Old 03-08-2013, 07:39 AM
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Re: is it normal ???

I FL size everything; I want it to actually chamber when I'm hunting. That said, I adjust my dies to the rifle. I can usually get it down to a couple of thou. growth.

I must digress about the expander ball comment; if your necks are properly lubed the expander ball does nearly nothing to grow a neck. Run that sucker through on a highly carboned up dry neck and it's another story though; it's all a matter of using your tools correctly. The main growth factors are the brass's diameter change between fired and sized and the length of the brass being corrected shorter for headspace. That is usually less than .003" total growth.
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Old 03-08-2013, 08:23 AM
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Re: is it normal ???

Really .. I noticed on some other brass manufactured they grow up to 2.055 from 2.044.. That's a lot . I ordered a neck sizing die yesterday ..
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