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Case sizing

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/04/2008 at 21:18
snowflake77 View Drop Down
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I am seeking some info on a problem that I am having.  I am hand loading for the 300wsm and am using a lee dies and an rcbs competition seating die.  I have loaded about 75 shells some twice and some no more than 3 times. Using Norma brass.  I have found that a few of my shells are making it tight to get the bolt down.  Not so tight that it takes a ton of pressure to get the bolt down but enough to know there is something wrong.  What part of the reloading process is causing this?  My c.o.a.l. is all measured and below tolerance and also all of the cases are the same lenght. Can I get these cases back in shape?  I have a casemaster gauge but not really sure what to look for.  Thanks for your response.
Matt
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/04/2008 at 21:32
pyro6999 View Drop Down
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they measure under the trim length?? sounds to me like the cases are getting to long, you use a full length resizing die??
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/04/2008 at 21:40
BeltFed View Drop Down
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Questions: are you full length sizing your cases or just neck sizing? Do you have a case gauge that measures the headspace? What kind of press are you using?
It sounds like you are not setting the shoulder of the case back far enough. You may need to get a good case gauge from Brownells or competitor to help adjust the proper headspace of the case.
A quick fix would be to turn your sizing die down 1/8 turn, size a case and try it in your rifle, repeat until the case fits. Also make sure you are lowering your press handle all the way down.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/04/2008 at 21:45
pyro6999 View Drop Down
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i had a similar issue to this with my 22-250 and i ended up trimming a few but most of them i ended up resizing and turning the die in a little and for some reason the 2nd time it fixed it.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/05/2008 at 22:33
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I agree with beltfed in that it sounds like the shoulder is not being set back far enough.  Lower the die about an 8th of a turn more.  
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/05/2008 at 23:00
Roy Finn View Drop Down
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I don't own a 300 WSM, but this is not the first I've read of someone having the same problem you describe. There was some talk about this on another site and it was discovered that the factory chambers were not cut correctly which resulted in the fired case being non-concentric. Don't fire the messenger on this one, but that was the result. Apparently even full length resizing didn't fully bring the cases back into spec. The rifles at that time being discussed were Winchester 70 Featherweight's. The others here are giving you good advise on adjusting your sizing die, but if you go down to far you will bulge the shoulder so to speak and create a new problem. Another issue that I have personally experienced is not putting enough case lube in the necks and this results in the expander ball stretching the case necks as you pull the expander ball out during sizing. Hornady One Shot fixed that problem. Not sure what type of tool you could use to check for case concentricity(sp?) with fired cases, but I would ask a few here and I'm sure they will come up with something.




http://www.24hourcampfire.com/ubbthreads/ubbthreads.php?ubb=showflat&Board=11&Number=2376554&Searchpage=2&Main=190928&Words=300+WSM+hard+chambering&topic=0&Search=true#Post2376554

Edited by Roy Finn - September/05/2008 at 23:15
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/06/2008 at 01:44
www.technika.nu View Drop Down
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Take some of the brass that you have fired before and hold it over a candle making the shoulder black.
Then rezise it, if there still is black on the shoulder you are not rezising enough and have to set back your sizer.
 
Technika
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/06/2008 at 10:10
tahqua View Drop Down
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Originally posted by www.technika.nu www.technika.nu wrote:

Take some of the brass that you have fired before and hold it over a candle making the shoulder black.
Then rezise it, if there still is black on the shoulder you are not rezising enough and have to set back your sizer.
 
Technika


+1 on that tip. It is fast, simple and works.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/07/2008 at 20:55
snowflake77 View Drop Down
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Thanks to all that gave me tips. I was not putting enough pressure when de-priming. I found out that there is a fin line between to much and too little pressure. Once I got used to the press I could feel the collet actually working. As I tested I chambered the shells and once they felt decent I set it there.  I am happy to say that I finally got my m70 sub MOA.
300WSM
Norma Brass
180 gr. Speer Boat Tail Spitzer.
70.2 gr. H4831SC
Fed 215
2.86 COAL
Swarovski 3-12 SR
Took me a little bit to get used to the scope as the paralex gets bigger with maginification. Definitely nothing like the 6-20 Ziess that I sold on ebay to purchase this scope.  Just wanted to save weight as my other rig weighed about 13lbs (300RUM) and this is at 8.2lbs. 
Heading to Idaho for two weeks to hunt unit 39 which includes the Sawtooth. Need all the weight savings I can get as I will be on foot. Got to love the MRE's
Thanks again
Matt
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/07/2008 at 23:23
www.technika.nu View Drop Down
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Regardless of your priming problem I still think that you SHOULD adjust your sizer die and not just run it to bottom touches shellholder.
The tolerances are that way to big and you can get a very short shelllife if you are sizing them to much.
 
Technika
 
 


Edited by www.technika.nu - September/07/2008 at 23:24
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/08/2008 at 20:22
snowflake77 View Drop Down
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Will check with the candle. Thank you for saving me some $$ on brass.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/08/2008 at 20:41
Roy Finn View Drop Down
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I can save ya even more. Go to your household junk draw, pull out a "Sharpie" magic marker and use that to paint the neck black. Save the candles some something else.
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