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Newbie reloading (case length question)


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Old 12-19-2013, 12:01 AM   #11
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Originally Posted by nitestalker View Post
Well if you had a Dillon no problem. Dillion has an automatic trim die and vac that trims and cleans the brass shaving away. If you anneal your brass you will not need to trim as often.
The main consideration in trimming to proper length is neck thickness. The brass flow forward from the case to the end of the neck. This flow obviously is not even. The neck then has thick and thin areas around the neck. This causes off set bullet alignment to the bore and eradict and often dangerous pressure spikes. The OD of the neck must be turned after trimming to eliminate this problem. The internal of the case must be checked for incipient separation. All that brass you trim off weakens the case body.
I also have their auto trim. Damn handy thing. I've found if I don't anneal or anneal at some point bottlenecks split at the case mouth. Annealing they go longer before that happens and like you say some may seperate in the body or neck.

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Thanks to all for the responses and help. My strategy will be to trim all cases to 1.750.....then size a few (full length die) and see where they end up for length. If they all remain within "tolerance" (under 1.760) I'll "run 'em thru" on the progressive press because, again, these will just be for plinking and recreational shooting. Also, as previously stated, the goal is to practice reloading and learn.
I WILL be curious (for the purpose of learning) to see how consistent in length they might be...or to see whether they vary in length (yet still be within tolerance). Someday, after I have mastered the basics, I will try my hand at accuracy loads and I can picture myself spending a lot of time, love and care with each individual case. Finally, I do beleive a turret has some advantages over a progressive press (easier to use as a single stage) but I have found that I can do it on my progresive Hornady by removing the pawls on the press to prevent it from rotating.

Not a good idea. If your serious about the hobby and you better be because loading using unsafe practices as you are describing lead to kabooms. Too much length in a bottleneck or a cartridge that doesn't space off the mouth leads to over pressure when the case is overlong which then leads to kabooms.

There is no shortcut for sizing then trimming on such cases. The round doesn't care if your hunting dangerous game or plinking or going to war, if you use an unsafe practice its going to bite you in the ass at some point


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Old 12-19-2013, 12:52 AM   #12
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Cases have all been de-primed and cleaned PRIOR to this step. I used a Lee de-capping die to removed the primers in a separate operation. Some of the brass is military, and I find that the Lee de-capper worked better than the re-sizing die.

Regarding the good advice on the danger of an overlength case, is that still a concern if the cases are still "within tolerance" (case "trim length" is listed as 1.750 and case "maximum length" (same manual) is listed at 1.760 ?



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Old 12-19-2013, 01:20 AM   #13
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Neck thickness is very important. The thick neck causes a radical rises in pressures as well as OAL. Necks grow in thickness as they grow in length. Before the neck is sized place the correct bullet in the neck. If the bullet does not fall freely in to the case body the neck needs turning on the ID.
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Old 12-19-2013, 09:18 PM   #14
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I appreciate all the help. Getting back to case length for a minute, there is a "trim to length" case length (1.750 in this example) and there is also a "maximum" case length (.010 more at 1.760).....can somebody tell me why the "maximum" case length is also listed, and how does this measurement apply to my situation?
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Old 12-19-2013, 09:37 PM   #15
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I appreciate all the help. Getting back to case length for a minute, there is a "trim to length" case length (1.750 in this example) and there is also a "maximum" case length (.010 more at 1.760).....can somebody tell me why the "maximum" case length is also listed, and how does this measurement apply to my situation?
You can be shorter than max or longer than minimum but exceeding either has issues. Too short can have bullets being pulled out of the case under recoil not a real issue with single shots. Too short can also lead eventually to uneven throat wear and stuck cases under some circumstances. To long and you run into over pressure.

I trim to minimum and segragate over long after sizing into a trim bucket. When I have a lot if too long cases I invite the wife to the loading room for a trim party... Since she shoots 308 and 223/556 it's something she is comfy helping with.

So while every case gets trimmed they don't get it till they go overlong. That's why I trim to minimum.
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Old 12-21-2013, 12:57 PM   #16
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So the question in my head remains.... If the "trim" length is 1.750 (and I trim all cases to that length) and the "max" length is 1.760 (.010 longer) what is the average "growth" when they are re-sized and what are the odds that the case can "grow" .010 or more?
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Old 12-21-2013, 01:46 PM   #17
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So the question in my head remains.... If the "trim" length is 1.750 (and I trim all cases to that length) and the "max" length is 1.760 (.010 longer) what is the average "growth" when they are re-sized and what are the odds that the case can "grow" .010 or more?
Depends on the powder charge of your load and your indivisual rifle's chamber.

For example, my wife's savage model 10 has a very tight chamber and cases can go several loadings before needing a trim while my scar17 is a bit looser so the cases need trimming more often
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Old 12-21-2013, 04:45 PM   #18
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Thanks, Jon...but it doesn't answer my exact question. I'm talking here about how much the case will "grow" during RE-SIZING.
Okay, in other words: I understand that I shouldn't "create" rounds where the case length is 1.760 or greater. So I begin by trimming all cases to 1.750 (which is the listed "tim length"). These cases are then sized with a full length die. I do understand that the case may be longer after re-sizing BUT...how much longer will they be DUE TO RE-SIZING? What are the odds that they may be longer than the max (1.760) if they start out at the trim length (1.750). put another way, what are the odds that RE-SIZING them will add .010?
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Old 12-21-2013, 05:14 PM   #19
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For a plinker and someone who is dumping the powder, you are very anal about case length. I suppose "professor" explains that. Get away from the computer and do some shooting and reloading. And take some measurements.
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Old 12-21-2013, 05:37 PM   #20
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OP most here de-prime / re-size first then trim length any other way just double works you & the brass Mickey


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