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Trimming Brand New Brass?
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 Posted: Tue Apr 19th, 2016 03:27 AM
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Northwoods
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Beginner here. I have 200 pieces of brand new Norma 7mm RM brass.

Should I trim all to the exact same length before sorting by weight and FL sizing for the first time?

Thanks!



 Posted: Tue Apr 19th, 2016 04:44 AM
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woodsman777



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Hello Northwoods
Norma brass should be ready to load and shoot it's that good a quality
If you only have a couple thousands variation in length I would load and shoot
and it should be sized check your chamber but that stuff should be ready to load



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 Posted: Tue Apr 19th, 2016 11:33 AM
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Ruffian
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woodsman777 wrote:
Hello Northwoods
Norma brass should be ready to load and shoot it's that good a quality
If you only have a couple thousands variation in length I would load and shoot
and it should be sized check your chamber but that stuff should be ready to load

Have to agree its right after Lapua Brass.Don't know how crazy your with the brass if just hunting I would do a check on the case length only at first



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 Posted: Tue Apr 19th, 2016 12:18 PM
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Ozark Ed



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Whatever trimming would be needed after full length sizing, not before. If you are crimping the bullets you will find trimming facilitates a more uniform crimp.



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 Posted: Tue Apr 19th, 2016 01:40 PM
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Ruffian
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ED, I usually don't go crazy till after my first firing. For the bench guns I'll weigh , check necks see just how close they all are.Sell off the big variance brass ones.



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 Posted: Wed Apr 20th, 2016 09:38 PM
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Northwoods
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Thanks guys. I'll check them and see where they measure. Where do I find the maximum case length for the 7mm RM? Or the recommended case length? I'm looking at the Lee and Lyman handbooks. Lee only has 2.500 listed in the case diagram and Lyman has 2.500 also listed in the case diagram but also has a trim-to-length number of 2.490. So I'm assuming that 2.500 is the maximum allowable length and if they exceed that I should trim to 2.490, is that correct?

Lots of beginner questions I know :) Thanks for the help!



 Posted: Wed Apr 20th, 2016 10:36 PM
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Ruffian
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2.490 trim to length..did you fire these already ? Or are you looking at virgin brass ?



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 Posted: Wed Apr 20th, 2016 10:57 PM
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Paul Tummers



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I do it always, first resizing and trimming before I reload new brass, I then know it has the same dimensions as the other brass already in use and the POI will not be different very much. I use my rounds for hunting in first place, so the first shot counts.



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 Posted: Thu Apr 21st, 2016 02:15 AM
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Northwoods
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The Norma cases are brand new and I did not size them at all. I measured a handful and they range from 2.490 to 2.496.

Last edited on Thu Apr 21st, 2016 02:15 AM by Northwoods



 Posted: Fri Apr 22nd, 2016 02:39 AM
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Northwoods
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As long as I'm below 2.500 COAL, what would be an acceptable range of variation in COAL? How many thousandths?



 Posted: Sun Jun 5th, 2016 03:08 AM
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Always prepare your brass and check cartridge length. Even the best brass will be off. I full length, then neck size only until I reach five times fired then full length size, repeat. Make sure you check primer pockets and flash holes. I also shoot 7mm RM.



 Posted: Sun Jun 5th, 2016 11:53 AM
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Ruffian
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Northwoods,
Check out annealing brass will save brass and add to case life. Then it may improve your zero .:thumbs:



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 Posted: Sun Jun 5th, 2016 01:18 PM
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Paul Tummers



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That annealing is good, but I think without professional tooling it will be difficult to anneal every case exactly to the same degree of hardness which will result in difference in bullet grip force?



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 Posted: Sun Jun 5th, 2016 03:13 PM
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Paul Tummers wrote:
I do it always, first resizing and trimming before I reload new brass, I then know it has the same dimensions as the other brass already in use and the POI will not be different very much. I use my rounds for hunting in first place, so the first shot counts.

Absolutely! Must have consistency too. Once you establish your method and mantra for reloading, you know that everything will function properly when needed.



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 Posted: Sun Jun 5th, 2016 03:50 PM
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Ruffian
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Paul,
You are right on with the machine. My friend has one and I bring some beers and we anneal the brass, besides its much much faster and cleaner with the machine-will do some 3-400 at a time.. But it does save brass and add like.



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 Posted: Sun Jun 5th, 2016 05:01 PM
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Paul Tummers



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For the brass I use in my nitro rifles, I take the loss after so and so many reloads but keep the lot together until there are too many of it discarded already and then the rest also goes into the scrap bin. For BP, I do not work those cases very hard anymore after the first annealing for the forming process, the bullets are seated without resizing the cases in any way, it is target shooting and every bullet well be checked for its proper seat with my thumb before loading into the rifle, no neck sizing, just "Glued" into the case by its lube which is a mix of beeswax and Ballistol.



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 Posted: Sun Jun 5th, 2016 11:39 PM
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Purchased 200 new Norma cases and have fired only about half of them so far so I have no experience with "how many reloads I can get out of a single case" yet. I just loaded up another 30 for some range testing today. Once I have fired all of them, I will reload by bumping the shoulder back .002 using a FL die. Curious to see how many times I can do this on a case before I have web bulging issues or the neck/shoulder brass gets hard and I have tension issues holding the bullet. I have read a lot on annealing, but don't know yet if that is something I'm going to get into or not... time will tell. Thanks for the good discussion.



 Posted: Mon Jun 6th, 2016 11:43 AM
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Ruffian
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Northwoods,
Take your time- you doing it right.. besides it will take some time to go through that brass on rotation. Are you using a case gauge or just keeping track of your measured brass ? I like the Wilson case gauges and will also measure them from time to time ( spot check them ).



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 Posted: Mon Jun 6th, 2016 04:36 PM
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Paul Tummers



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Make "Lot"s of them, keep those lots together, clean them in lot's and keep record of everything you do with that lot, then you will know what has happened with those cases, how many times reloaded, when trimmed etc. It improves your accuracy because mixing cases which have been reloaded 2 times with cases that already have been reloaded 10 times will result in different neck tension from round to round which will not be a contribution to accuracy. I make lot's of 50 rounds, when I measure them and 1 of those cases is near to max. length, I trim them all.



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 Posted: Mon Jun 13th, 2016 04:38 AM
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I just don't see the amount of worry over crimp or trimming.
Short the cases to form them to your chamber and THEN worry about trimming to consistent length.
I played that game and none of my rifles, including sub-MOA rifles showed any improvement.
Now, if you shooting 0.5MOA or smaller, you "might" see some improvement from a consistent case length and crimp (if you even crimp your bullets).
But FIRST, fire-form them to your gun, then worry about case prep tricks.



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