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ReSizing Question

 
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  #1  
Old 08-20-2013, 06:49 PM
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ReSizing Question

Hey guys been awhile since I have been on here. I just finished building a new 300wsm and am getting ready to build a few loads for it. I have loaded a little in the past with some success but by no means an expert hence my question.

So here it is I set up my dies according to the instructions as usual. Spun it down to the shell holder then went a 1/4 turn more and started resizing. I checked one of the empty cases in the chamber and it closes just fine no pressure needed or anything like that however when I go to pull the bolt back it is a little sticky and takes a tap or two nothing major but I am sure something isn't right. I checked with a mic and the only difference I can see is way in the back by the rim I get a reading on factory ammo of .547 and on my resized casing I get .553. Is this what is doing it and if so how do I correct doesn't seem like the FL sizing die even goes down that far.

thanks in advance for any help you can give
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  #2  
Old 08-20-2013, 07:02 PM
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Re: ReSizing Question

I'm not a FL sizing type reloader, and I would never size cases based on written instructions. They'll help you there.

But I wonder about your extraction.
Do you get full bolt turn on opening -and then have to pull the case from the chamber?
Or does the case seem to pop free just near the top of bolt turn?
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  #3  
Old 08-20-2013, 07:20 PM
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Re: ReSizing Question

Getting full rotation everything feels normal just takes a lil extra pull or tap on the bolt handle to get it out and the extractor pulls it out not like needing to punch it out of chamber or anything
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  #4  
Old 08-20-2013, 09:12 PM
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Re: ReSizing Question

That .553" diameter on a fired case that had .547" diameter when new concerns me. That's a .006" increase in diameter. Was it measured on the case rim behind the extractor groove or in front of that groove on the case body?

What load are you using?

Here's the cartridge spec'd dimensions:

http://www.saami.org/PubResources/CC...t%20Magnum.pdf

Try blackening the entire back end of a reloaded case with a black marker, then chamber and extract it. Look for shiny spots or scrapes and scratches where the case interfered with the rifle parts. That'll show you where something's happening that might be bad. Post your results; pictures would be great.

I've been full length sizing all my cases for decades. My match rifles shooting such stuff do as well as long range benchrest rigs, so I see nothing bad about doing so. While some adamantly object to even trying such sizing ways doing it how many people win matches and set records full length sizing their fired cases, there is more than one way to eat pie, too, and it'll taste perfect to all of them.

There's no problem following a die set's included instructions as long as one realizes they may not produce the most accurate ammo nor longest case life.
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  #5  
Old 08-20-2013, 09:38 PM
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Re: ReSizing Question

The measurement was taken just above the rim where the .5550 measurement is taken in the saami specs so it seems to be within tolerance how ever when I blacken the case with a sharpie this it where I am getting a very faint rub mark. It's not much but this is where it is making contact. It may be important to note this is once fired brass from a different rifle not the one I am loading for
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  #6  
Old 08-20-2013, 09:45 PM
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Re: ReSizing Question

That rub mark probably indicates the case was ovesize for your rifle's chamber and your die doesn't size it back down enough.

Sizing dies have tolerances. Your's may be at the big end of specs.
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  #7  
Old 08-21-2013, 05:42 AM
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Re: ReSizing Question

Can you give some specifics on the brass you are using? Make, times fired, fired in same rifle you are loading it for, etc?
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