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slimjim Super Member
Joined: May 16, 2009 Posts: 8314 Location: Fort Worth TX
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Posted: Sat Jun 16, 2012 2:42 pm Post subject: How far back to you trim your cases? |
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Got myself some .270 Win full-length resizing dies and case trimmer after neck sizing only for 3 years. Ran a bunch of cases through the FL die. They all "grew" to be longer than max case length which is 2.540" for the .270. So I trimmed them all back to 2.525" - an easy number for me to remember and thought I'd leave enough room so I didn't have to trim them all the time. Well, now that I have fired them, they all "shrunk" and are shorter than 2.525". Didn't see that one coming.
What dimension would you have recommended I trim my cases to?
_________________ "To anger a conservative, lie to him. To anger a liberal, tell him the truth." - Theodore Roosevelt
"The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it." - Albert Einstein |
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Ominivision1 Super Member
Joined: Sep 20, 2010 Posts: 2984 Location: Iowa
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Posted: Sat Jun 16, 2012 3:26 pm Post subject: Re: How far back to you trim your cases? |
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All my books show a trim to length at 2.530" for the 270win. When I do need to trim bottle neck cases, I try to stay in the middle between max and min.
_________________ Regards
Limitations are but boundaries created inside our minds. |
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Donut Slayer Super Member
Joined: Jun 27, 2007 Posts: 594 Location: Pensacola, Florida
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Gil Martin Super Member
Joined: Jan 28, 2005 Posts: 1837 Location: Schnecksville, PA
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Posted: Sat Jun 16, 2012 4:00 pm Post subject: Re: How far back to you trim your cases? |
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Another vote for the Lee case trimmers. I resize the cases and when the Lee trimmer stop cutting brass, I chamfer and debur the cases and load them. All the best...
Gil
_________________ Gil |
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Grumulkin Super Member
Joined: Apr 16, 2007 Posts: 365 Location: Central Ohio
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Posted: Sat Jun 16, 2012 4:43 pm Post subject: Re: How far back to you trim your cases? |
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Fired cases will always be shorter than when they started out. When you resize them, they will lengthen again.
If you've shot these cases a number of times, be sure to check for incipient case head separations. When you have to trim cases, it means the brass is thinning above the web which, when progressed far enough, will result in a head separation.
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PaulS Super Member
Joined: Feb 18, 2006 Posts: 4330 Location: South-Eastern Washington - the State
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Posted: Sat Jun 16, 2012 6:50 pm Post subject: Re: How far back to you trim your cases? |
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I keep mine trimmed to minimum dimensions. It is the step in the reloading process right after sizing and decapping. While I have it in my hand I can inspect it for flaws.
_________________ Paul
__________________
Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
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Always check data against manuals
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Pumpkinslinger Super Member
Joined: Sep 22, 2007 Posts: 5002 Location: NC foothills
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Posted: Sat Jun 16, 2012 7:35 pm Post subject: Re: How far back to you trim your cases? |
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The "trim to" length always works for me.
_________________ Mike
"I ain't no better than anybody else, and there ain't nobody better than me!" Ma Kettle |
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Bushmaster Super Member
Joined: Jun 12, 2005 Posts: 11393 Location: Ava, Missouri
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Posted: Sun Jun 17, 2012 7:16 am Post subject: Re: How far back to you trim your cases? |
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I only have .30-30 and .30-06 rifle cases to trim. I trim the .30-30 cases to insure an even crimp on all loads. The .30-06 cases to min.
All straight wall revolver cases I also trim to insure the same crimp on all. Hell...I even trim .45 ACP cases to .890" +/- .001 because my Colt 1911 prefers them at .890"
_________________ I have one nerve left and yer standin' on it...
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LIBERTY A well armed sheep contesting the outcome of the vote... |
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1895ss Super Member
Joined: Jul 21, 2005 Posts: 2612 Location: Not Here...!!
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Posted: Sun Jun 17, 2012 10:37 am Post subject: Re: How far back to you trim your cases? |
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I always trim to minimum length when trimming is nec.
_________________ A cruel truth is much more desirable than a really nice lie.
'Tis far better to walk alone than to follow a crowd or an a**hole going the wrong way. |
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chambered221 Super Member
Joined: Aug 17, 2007 Posts: 3455 Location: Lost for good !!!
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Posted: Sun Jun 17, 2012 10:38 am Post subject: Re: How far back to you trim your cases? |
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Standard trim length is .010 under max length !!!
You probably re-sized the case more than what was needed.
This will typically happen with excessive sizing of the body..... sometimes it's just the way the die is made other times because you've set the shoulder back more than what is need for your chamber.
Keep in mind you shrunk the diameter of the case and lengthened it with the re-sizing die, upon firing the opposite occurs !!!
_________________ Ask as many people needed, sooner or later your question will be answered the way you want it answered !!!
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Elvis Super Member
Joined: Jul 27, 2008 Posts: 9253 Location: south island New Zealand
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slimjim Super Member
Joined: May 16, 2009 Posts: 8314 Location: Fort Worth TX
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Posted: Sun Jun 17, 2012 3:54 pm Post subject: Re: How far back to you trim your cases? |
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I've got a bunch of brass fired from a different rifle. I'm going to FL resize then neck size after that. Think I'll trim to 0.005" after the FL then shift back to 0.010" long term.
Thanks for the inputs!
_________________ "To anger a conservative, lie to him. To anger a liberal, tell him the truth." - Theodore Roosevelt
"The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it." - Albert Einstein |
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Dawgdad Super Member
Joined: Feb 08, 2006 Posts: 1065 Location: On the Prairie
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Posted: Sun Jun 17, 2012 6:43 pm Post subject: Re: How far back to you trim your cases? |
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Well - now that you are into FL resizing... Look at the X-dies from RCBS. trim it once.
I can visualize what happens to brass during firing if I imagine the case as a watter balloon. When you squeeze it into the sizing die it gets longer like grabbing a water balloon in the middle. When you fire the case it expands to fill the chamber which means it has to get shorter to get fatter.
always measure for trimiing after sizing.
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fnuser Super Member
Joined: Dec 23, 2008 Posts: 914 Location: S.W. Missouri, U.S.A.
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Posted: Mon Jun 18, 2012 5:53 pm Post subject: Re: How far back to you trim your cases? |
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I do it like Omni does, because A, they worked at the last fired length. B, anything shorter then the trim to length leaves less neck to fill the chamber, and gives the chamber neck more opportunity to wiggle or let the bullet yaw before entering throat region.
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wncchester Member
Joined: Apr 08, 2006 Posts: 160
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