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How far back to you trim your cases?
Discussion regarding the reloading of ammunition and tuning of loads for accuracy
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slimjim
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PostPosted: Sat Jun 16, 2012 2:42 pm    Post subject: How far back to you trim your cases? Reply with quote

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?

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Ominivision1
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PostPosted: Sat Jun 16, 2012 3:26 pm    Post subject: Re: How far back to you trim your cases? Reply with quote

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.

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Donut Slayer
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PostPosted: Sat Jun 16, 2012 3:54 pm    Post subject: Re: How far back to you trim your cases? Reply with quote

I use a Lee case trimmer, so I dont have to measure.

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Gil Martin
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PostPosted: Sat Jun 16, 2012 4:00 pm    Post subject: Re: How far back to you trim your cases? Reply with quote

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

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Grumulkin
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PostPosted: Sat Jun 16, 2012 4:43 pm    Post subject: Re: How far back to you trim your cases? Reply with quote

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
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PostPosted: Sat Jun 16, 2012 6:50 pm    Post subject: Re: How far back to you trim your cases? Reply with quote

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.

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PostPosted: Sat Jun 16, 2012 7:35 pm    Post subject: Re: How far back to you trim your cases? Reply with quote

The "trim to" length always works for me.

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Bushmaster
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PostPosted: Sun Jun 17, 2012 7:16 am    Post subject: Re: How far back to you trim your cases? Reply with quote

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"

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PostPosted: Sun Jun 17, 2012 10:37 am    Post subject: Re: How far back to you trim your cases? Reply with quote

I always trim to minimum length when trimming is nec.

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PostPosted: Sun Jun 17, 2012 10:38 am    Post subject: Re: How far back to you trim your cases? Reply with quote

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 !!!

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Elvis
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PostPosted: Sun Jun 17, 2012 3:51 pm    Post subject: Re: How far back to you trim your cases? Reply with quote

Gil Martin wrote:
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
me too its easy peasy to do and takes no time at all especially if you use the cordless drill Very Happy

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slimjim
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PostPosted: Sun Jun 17, 2012 3:54 pm    Post subject: Re: How far back to you trim your cases? Reply with quote

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!

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Dawgdad
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PostPosted: Sun Jun 17, 2012 6:43 pm    Post subject: Re: How far back to you trim your cases? Reply with quote

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
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PostPosted: Mon Jun 18, 2012 5:53 pm    Post subject: Re: How far back to you trim your cases? Reply with quote

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
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PostPosted: Tue Jun 19, 2012 6:32 pm    Post subject: Re: How far back to you trim your cases? Reply with quote

"Standard trim length is .010 under max length !!!" Very Happy

True. And that's just a practical arbitrary amount without any 'specification' about it. We can trim to any lenght under max we wish, nothing will blow up if we cut back 50 thou. Laughing
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