I turn for my 6 PPC and 2 6-284's. The reamers on both were spec'd for turning. I believe what "MAY" be happening to you is the formation of a doughnut at the shoulder/neck junction. An inside reamer can take care of that. Turning necks on a "standard neck chamber can lead to overworking the necks and premature cracking/splitting. You can check for the doughnut by seating a bullet above the NK/SH jct. and one below that (base of bullet/boat tail) below the jct. Measure the differences and that should tell you.
Speaking of "neck turning" is there...
So, I posted this in another thread in this site, but it seemed that I might have a better chance of picking the collective knowledge base of this website in this particular forum. What I am specifically looking for is info relating to "neck turning". Are there any standards, charts, etc. that can be linked so I can start learning about this new area of interest and concern.Speaking of "neck turning" is there a general dimension for the wall thickness of the brass. That is question #1!!!
I had some .243 reloads that showed signs of high pressure, but I have used this load data before with no signs of high pressure. I know case metal moves forward to the shoulder and neck areas as the case is repeatedly fired and resized. A neck wall that has thickened too much may not have enough room to expand to release the bullet. That is question #2. Any insight or experience relating to this situation would be greatly appreciated???
God Bless, Frank.
God Bless, Frank.
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I turn all my necks with an old J Dewey neck turner. Have learned by feel not to be too aggressive and take the minimal amount necessary. Many once fired cases are shockingly bad and uneven.
Wall thickness varies by brass manufacturer slightly for the cartridge. Example Hornady vs nosler on one cartridge. So far I've witnessed a range of .012-.016 I like knowing that measurement as what part of the overall loaded thickness is wall for neck bushing for setting the desired tension and since the bushing is doing it from the outside. On mandrel sizing that matter less.
My thoughts where around neck turning was primarily concerned around the most minimal removal necessary for equality of casing.
Wildcatting or resizing becomes a decision spot though and you might see someone turn cases to all .013-.014 after converting to a diff chamber.
For charts you can derive it from Sammi.
Example 6.5 creedmoor
Loaded Neck thickness .2950
Bullet .2644+-.003
Diff .030
Assumed wall .015 (and much creed is)
However empirically you have to confirm. Factory loaded cases that you are using are helpful to compare.
I only list the above as the case thickness is blueprint derivable from sammi and matches ranges you see in the wild.
Where it gets weird is ammo that's .016 on one area and .015 on another and benefit from turning to true it up.
So let's say you want to examine a .243 for too thick a loaded neck. You can simply measure and compare to Sammi. Why it's too thick then requires pulling the round to measure and get case wall thickness as out of spec projectile is another modifier of overall loaded thickness.
Are you jumping to lands or are you loads chasing?
My thoughts where around neck turning was primarily concerned around the most minimal removal necessary for equality of casing.
Wildcatting or resizing becomes a decision spot though and you might see someone turn cases to all .013-.014 after converting to a diff chamber.
For charts you can derive it from Sammi.
Example 6.5 creedmoor
Loaded Neck thickness .2950
Bullet .2644+-.003
Diff .030
Assumed wall .015 (and much creed is)
However empirically you have to confirm. Factory loaded cases that you are using are helpful to compare.
I only list the above as the case thickness is blueprint derivable from sammi and matches ranges you see in the wild.
Where it gets weird is ammo that's .016 on one area and .015 on another and benefit from turning to true it up.
So let's say you want to examine a .243 for too thick a loaded neck. You can simply measure and compare to Sammi. Why it's too thick then requires pulling the round to measure and get case wall thickness as out of spec projectile is another modifier of overall loaded thickness.
Are you jumping to lands or are you loads chasing?
More questions. When should I turn the necks??? Before resizing or after resizing??? Or does it depend on the pilot size???
Anybody have a particular preference for a particular brand of neck turner and WHY do you have that preference???
God Bless, Frank.!!!
Anybody have a particular preference for a particular brand of neck turner and WHY do you have that preference???
God Bless, Frank.!!!
My .243 Win is a 788 Remington. I found that it is critical to bump the shoulder back a couple thousands as I have run into difficult bolt closure. I have the RCBS case and headspace micrometer set that is used to setup dies and check headspace and seating depth.
Many/most times neck turning is either for squeezing that last bit of accuracy out, or it is because you are cutting or necking down some other case as a parent to make some cartridge, like making 300 blackout from 223 brass. In this case, some known-to-be-thicker brass is thick enough on the body where the new case neck ends up being that it will cause the outer neck diameter to be out of saami spec for the loaded ammo, causing issues when you try to chamber your loads.More questions. When should I turn the necks??? Before resizing or after resizing??? Or does it depend on the pilot size???
Anybody have a particular preference for a particular brand of neck turner and WHY do you have that preference???
God Bless, Frank.!!!
Since it is pretty much a one-time operation on a piece of brass, my bet is either it is being done as during the brass creation stage (for those cutting down other cases, etc it is kinda mandatory before you can even shoot them...) or when starting with a fresh lot of brass before the first reloading (the guys trying to take .001 off their group sizes)
I utilize a neck sizer to flare the neck and to plunge the sizer beyond the shoulder. I then check the outside diameter to specifications. If it is too thick I discard the cartridge. It is just not worth the extra equipment and effort. Being I form .222's and 221's from .223 cartridges I utilize only certain brands that give me the right thickness.
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