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Post by paheritage on Oct 28, 2007 12:27:34 GMT -4
ok just talked to a guy at the range and he told me he trims his cases after he resizes them . . i trim new cases to all the same length. and then i don't trim them after that . maybe i read the manual wrong . how do you guys do it?
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Post by fastarrows on Oct 29, 2007 11:22:16 GMT -4
Some calibers need trimmed due to high chamber pressures. If you hot load you should measure and cut if needed. The cases could get enlongated by the heat and pressure. Plus its a good idea to check just to be safe.
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Post by frankinthelaurels on Oct 29, 2007 18:24:32 GMT -4
GENERALLY do to the sloppy chambers of most factory rifles, you'll need to trim just about every time..especially with any magnum or high velocity round. Generally about .01 is needed and recommended by most reloading manufacturers..half that if it's a custom cut chamber with be fine. Most of these rifle makers today have .004-.008 clearance per side in the neck area..both sides together have alot of space that needs to be filled when the explosion takes place and that room is what causes the growth. IF your shooting a pump they make special small base dies that squeeze it a little tighter to make it slide smoothly..SHOULD you trim, ABSOLUTELY each time..ever notice those rifled marks on the very edge of the top of the case? They didn't just happen to be there...TRIM EM' you'll make life a little easier and safer..
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Post by whitetail101 on Oct 29, 2007 20:27:45 GMT -4
You should always make sure that your cases are not longer than the posted maximum case length listed in your loading manual.
If you don't trim your cases your inviting disaster if you fire that untrimmed round in your gun.
I use Lee's case trimming jig. It consists of a cutter, a catridge mandrel set to the max case length, and a shell holder that you can either place in a drill chuck or a specailly designed case trimming lathe.
good luck and be safe in your reloading.
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Post by paheritage on Oct 29, 2007 20:48:22 GMT -4
maybe i asked this wrong, what i'm asking is trim before or after runnin it in the sizing die i trim before i resize it. the guy said he does it after he resizes. which is it before or after resizing soory for the mix up
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onager
lodge member
Posts: 244
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Post by onager on Oct 30, 2007 14:54:28 GMT -4
Actually I appreciated all the responses. I trim after resizing. What you could do is measure before and after sizing and compare.
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Post by paheritage on Nov 1, 2007 11:38:22 GMT -4
ok thanks
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Post by coloh2ofwlr on Nov 1, 2007 17:20:19 GMT -4
I am using an RCBS pro 2000 progressive reloader. In order for me to resize and then trim defeats the purpose of the progressive reloader! I trim all my cases to the 'trim-to' length and then resize them as that is the first station on my press. I tested this on a few cases and then measured the overall case length, and every time i was will below the max case length as listed in the Speer #13 manual. This procedure was recommended in the manual that came with my press.
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Post by billt on Nov 21, 2007 9:43:01 GMT -4
I also regarded trimming as one of those PITA tasks of reloading. Then I finally broke down and purchased one of those RCBS Case Prep Centers. Man, it's the best $100.00 I ever spent on reloading! This thing won't trim to length, but it does everything else associated with trimming. It cleans and squares the primer pocket. Plus it pust a nice chamfer on both the inside, as well as the outside of the case. My wrists used to get sore doing that. It has 5 powered stations that all rotate and can do all of the above mentioned steps in about 10 seconds. I shoot a lot of .223 and this makes it very easy and fast to prepare cases. It's like a microwave oven. Once you get one, you'll wonder how in the hell you lived without one for so long! Bill T.
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Post by blackhawk on Nov 21, 2007 9:58:19 GMT -4
Trim after resizing! the expander ball,is just above the depriming pin on your dies, as you raise the case into the die,at near the top of the stroke,is where the outside of the case neck is sized,as you lower the case ,just at the bottom of the stroke is where the expander ball is coming up through the inside of the case neck (expanding it slightly) this can also stretch the sized case slightly,therefore ,you should trim to length,after resizing! HOPE THIS HELPS YOU.
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Post by paheritage on Nov 21, 2007 18:35:10 GMT -4
ok thanks for the info
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