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Reloading Berger Bullets


Case Trimming

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Unread 08-01-2012, 10:49 AM
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Join Date: Apr 2012
Location: The cold part of Montana
Posts: 1,391
Re: Case Trimming

Originally Posted by Clark View Post
I did a large scale experiment on trimming with a handful of dies and a handful of rifles.
Each population of brass was kept to one die.
I measured the case growth and trimmed with an RCBS 3 way in the vertical mill.

The lessons I learned are close to common knowledge.
The best way to trim is to not trim.
The best way to not trim is to keep brass dedicated to one rifle and either neck size, partial fl size, or push the shoulder back .001" with a FL die.

I could do 25 firings of 223 at 66kpsi by using a Lee Collet die, without trimming.
There's nothing 'wrong' about doing that but normal variations of the necks in individual case will have a much bigger effect on grip than a few thou of length.
This pretty well sums it up for me.
Keep in mind the animals we shoot for food and display are not bullet proof. Contrary to popular belief, they bleed and die just like they did a hundred years ago. Being competent with a given rifle is far more important than impressive ballistics and poor shootability. High velocity misses never put a steak in the freezer.

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Unread 08-01-2012, 11:03 AM
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Join Date: Jan 2012
Location: Pennsylvania
Posts: 245
Re: Case Trimming

I don't have a ton of experience, but why would you not trim? Seems it would keep consistency, especially for loads with a crimp.
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Unread 08-01-2012, 05:16 PM
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Join Date: Aug 2003
Location: NC, oceanfront
Posts: 4,223
Re: Case Trimming

I don't see any implications that trimming shouldn't be done, at least early in preps/forming.
But it would be a real pain(to re-trim & re-chamfer well), and sometimes unnecessary to do frequently.
It's an indicator of brass changing, as it's being trimmed away, and I for one prefer that my brass does not change at all.
I also do not like huge clearances from chamber end, as this contributes to excess sooting and higher ES. So I would not trim brass to some unknown, or inappropriate value for MY chamber.

If you have to do a lot of FL sizing, you're gonna have trim more frequently, so you might as well set up a good process for it. All we do IS a choice,, one leading to others.
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