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Resizing New Cartridges
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Picture of Grumulkin
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I'm wondering, when I buy a new box of factory cartridges, do I dare trust the manufacturer or should I resize and trim the brass before shooting them?

What do you all do?
 
Posts: 2911 | Location: Ohio, U.S.A. | Registered: 31 March 2006Reply With Quote
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I usually full length size, check OAL, then inside/outside chamfer. I used to ream the flash holes, but gave that up quite some time ago.
 
Posts: 8169 | Location: humboldt | Registered: 10 April 2002Reply With Quote
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Full length resizing should not be necessary but yes, do neck size. Fire form your brass before thinking of trimming. What brass are you using?
 
Posts: 10 | Location: South Africa | Registered: 24 September 2012Reply With Quote
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I do exactly as Craigster.


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Posts: 2646 | Location: Minnesota | Registered: 08 December 2006Reply With Quote
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Offhand, I don't know of any way to resize a cartridge. They are speced to begin with at something less than maximum dimensions so that they will fit a chamber with minimum dimensions -- in fact, most factory cartridges are small enough that they rattle around a bit in most factory chambers. So why ever would anyone want to resize a factory cartridge before firing it?
 
Posts: 13243 | Location: Henly, TX, USA | Registered: 04 April 2001Reply With Quote
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quote:
Originally posted by Stonecreek:
Offhand, I don't know of any way to resize a cartridge. They are speced to begin with at something less than maximum dimensions so that they will fit a chamber with minimum dimensions -- in fact, most factory cartridges are small enough that they rattle around a bit in most factory chambers. So why ever would anyone want to resize a factory cartridge before firing it?


Well, I've heard of factory ammo being used in guns that blow up AND sometimes there are recalls of factory ammunition; not just one box but whole lots of ammo. This means that the ammo manufacturers don't know what they are doing. If they don't put the right powder in some ammo then obviously they could get the dimensions wrong on cases and even bullets. They might even accidentally use magnum primers.
 
Posts: 2911 | Location: Ohio, U.S.A. | Registered: 31 March 2006Reply With Quote
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I bought some brand new brass from remington for my .375 H&H. I just happend to notice the neck was out of round on one. I looked thru the whole batch and there were several that didnt suit me. I resized them all.
I alos had a hornady casing that was so large the bullet just dropped right in. That was the only one out of 50 though.


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Posts: 813 | Location: In the shadow of Currahee | Registered: 29 January 2009Reply With Quote
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The only factory cartridges I buy are 22lr Wink


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Posts: 3830 | Location: Cave Creek, AZ | Registered: 09 August 2001Reply With Quote
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Ive had the inside neck diameter too big. I neck size.
 
Posts: 63 | Registered: 06 June 2011Reply With Quote
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I'm with craigster on this. I do what he does.
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Posts: 1544 | Location: Fairbanks, Ak., USA | Registered: 16 March 2002Reply With Quote
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quote:
Originally posted by brno308:
Full length resizing should not be necessary but yes, do neck size. Fire form your brass before thinking of trimming. What brass are you using?


+1 I dont see much point in FL sizing since they need to fireform to your chamber anyway. But it seems like most of the time there will be dinged up, out of round necks, so I neck size to ensure a square fit and to prevent a damaged neck. I have never trimmed a new case.
 
Posts: 10164 | Location: Tooele, Ut | Registered: 27 September 2001Reply With Quote
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quote:
Originally posted by Blacktailer:
The only factory cartridges I buy are 22lr Wink


Do you resize them?
 
Posts: 2911 | Location: Ohio, U.S.A. | Registered: 31 March 2006Reply With Quote
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If they don't put the right powder in some ammo then obviously they could get the dimensions wrong on cases and even bullets. They might even accidentally use magnum primers.


"Resizing" factory cartridges would hardly correct for that!

I've never heard of factory ammo blowing up anything but I have heard of idiots shooting with obstructed bores and then blaming the ammo.
 
Posts: 1615 | Location: South Western North Carolina | Registered: 16 September 2005Reply With Quote
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I only NS the ones that are dented.FL sizing them is a waste of time and work hardens the brass.
 
Posts: 4372 | Location: NE Wisconsin | Registered: 31 March 2007Reply With Quote
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Picture of Grumulkin
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quote:
Originally posted by Jim C. <><:
quote:
If they don't put the right powder in some ammo then obviously they could get the dimensions wrong on cases and even bullets. They might even accidentally use magnum primers.


"Resizing" factory cartridges would hardly correct for that!

I've never heard of factory ammo blowing up anything but I have heard of idiots shooting with obstructed bores and then blaming the ammo.


I hear what you're saying. Probably ought to weight the powder and check the primers as well.

As for factory ammo not blowing up anything, I saw a guy probably a year ago now who in the past had a very severe arm injury when a shotgun blew up. He and another person, I believe his grandson, had been shooting it with the same factory ammo prior to the blowup with no problem. As far as he knew, the shotgun was in good mechanical condition before the tragic incident.
 
Posts: 2911 | Location: Ohio, U.S.A. | Registered: 31 March 2006Reply With Quote
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quote:
Originally posted by Grumulkin:
quote:
Originally posted by Jim C. <><:
quote:
If they don't put the right powder in some ammo then obviously they could get the dimensions wrong on cases and even bullets. They might even accidentally use magnum primers.


"Resizing" factory cartridges would hardly correct for that!

I've never heard of factory ammo blowing up anything but I have heard of idiots shooting with obstructed bores and then blaming the ammo.


I hear what you're saying. Probably ought to weight the powder and check the primers as well.

As for factory ammo not blowing up anything, I saw a guy probably a year ago now who in the past had a very severe arm injury when a shotgun blew up. He and another person, I believe his grandson, had been shooting it with the same factory ammo prior to the blowup with no problem. As far as he knew, the shotgun was in good mechanical condition before the tragic incident.


Every shotgun that I have known to blow up was from an object in the barrel.Might have had a squib load right before he fired.
 
Posts: 4372 | Location: NE Wisconsin | Registered: 31 March 2007Reply With Quote
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If you are using quality brass, no. If you're using bulk brass it's probably a good idea.

Ken....


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Posts: 5386 | Location: Phoenix Arizona | Registered: 16 May 2006Reply With Quote
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In the thousands and thousands of pieces of brass I have bought, I have never had a case that wouldn't chamber. Dented necks, oilcan shoulders, yes but they would still chamber handily. If I ever do get a piece that won't chamber, I may change my tune but until them, imo, it's just another one of those anal things that some reloaders like to do.


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Posts: 4348 | Location: middle tenn | Registered: 09 December 2009Reply With Quote
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quote:
Originally posted by craigster:
I usually full length size, check OAL, then inside/outside chamfer. I used to ream the flash holes, but gave that up quite some time ago.


yep

and the op means cases, not loaded ammo... words have meaning


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Posts: 39622 | Location: Conroe, TX | Registered: 01 June 2002Reply With Quote
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quote:
Originally posted by wasbeeman:
In the thousands and thousands of pieces of brass I have bought, I have never had a case that wouldn't chamber. Dented necks, oilcan shoulders, yes but they would still chamber handily. If I ever do get a piece that won't chamber, I may change my tune but until them, imo, it's just another one of those anal things that some reloaders like to do.

The necks are seldom round, particularly if bulk packaged in bags. I just back the resizing die off a bit and run them all through.
 
Posts: 1366 | Location: Houston, TX | Registered: 10 February 2003Reply With Quote
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I always full length size, equalize the primer pocket and flash-hole and run it through the trimmer (most are well short of needing to be trimmed) on new brass. After that first firing my cases get neck sized only leaving just enough of the neck unsized to help center the round in the chamber. Since I started doing this 40+ years ago I can make ammo that always shoots well under MOA groups.


Speer, Sierra, Lyman, Hornady, Hodgdon have reliable reloading data. You won't find it on so and so's web page.
 
Posts: 639 | Location: SE WA.  | Registered: 05 February 2004Reply With Quote
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quote:
Originally posted by Code4:
Some Rem brass is a crush fit first time. Had 20% of one lot of W-W .218 Bee brass fail to chamber once. Since then F/L size first reload everytime.

Lapua is the only brass I've had with nil problems.
 
Posts: 1433 | Location: Australia | Registered: 21 March 2008Reply With Quote
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My Lee collet sizing die works great on new brass to true up the necks!


Rusty
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