OP
OP
CCWdownrangeP2
Member
I'm just sitting back and enjoying the education! 
Thank you all. This is why I tell everyone about THR.
Thank you all. This is why I tell everyone about THR.
Impressed line around case-problem, or just my OCD?
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WestKentucky
Member
Oh well...maybe he fed me a line and I just accepted it. Oh well...either way we are way off track from the original post now.
So on those impressed rings, they are apparently there for decoration as much as anything these days. Leave it to a manufacturing facility to do something that increases the physical tooling needed, time needed, and expense to do...well...nothing.
So on those impressed rings, they are apparently there for decoration as much as anything these days. Leave it to a manufacturing facility to do something that increases the physical tooling needed, time needed, and expense to do...well...nothing.
The answer is; yes, it is just your OCD.
If you want to feed your OCD, try sorting all brass by cannelures: none, one, and two. It will give you something to do.
Or, you can sell all the cases with cannelures and not worry about the aesthetics any more.
If you want to feed your OCD, try sorting all brass by cannelures: none, one, and two. It will give you something to do.
Or, you can sell all the cases with cannelures and not worry about the aesthetics any more.
Jim Watson
Member
Case cannelures serve two purposes.
They prevent bullet setback in straightwall pistol cartridges. I have a device designed by me, made by my gunsmith, that applies a fresh cannelure to .45 ACP in one stroke of a single stage press. A lot faster and easier than the usual roller type cannelure tool. I use it for 185 gr JHPs with their slick jackets and short bearing surface. Not needed with other bullets.
They are for identification. You would have to know the code for the individual manufacturer and time period, which is unlikely for the reloader.
They prevent bullet setback in straightwall pistol cartridges. I have a device designed by me, made by my gunsmith, that applies a fresh cannelure to .45 ACP in one stroke of a single stage press. A lot faster and easier than the usual roller type cannelure tool. I use it for 185 gr JHPs with their slick jackets and short bearing surface. Not needed with other bullets.
They are for identification. You would have to know the code for the individual manufacturer and time period, which is unlikely for the reloader.
Inherent structural problem? No. I purchased 22,000 cases, most were pistol, all were once fired, by the time I purchased the cases the case had been flattened against the chamber, meaning the band around the case was an aid in separating cases.
Then there is the question: How was the 'ring around the case applied'? Without a mandrel in the case, applying the canula with a knurlier would result in making an ugly case.
If I was interested in determining the function of the 'ring around the case' I would pull down a new, over the counter factory round to determine if the ring had anything to do with the amount of powder, I would check to see if the knurl ring protruded into the inside of the case as in proving the ring prevented bullet set-back.
There are many methods that have been used to prevent the bullet from moving, in the old days the case was staked and or knurled after the bullet was seated. As I said, after the round has been fired the case becomes a once fired case, I like the ring around the case when sorting cases.
F. Guffey
dickttx
Member
I have always understood the cannula was to help prevent setback on bullets that have no crimping groove.
You can buy a cannula tool from C-H.
Oops, that tool is to make a cannula on bullets, not cases.
You can buy a cannula tool from C-H.
Oops, that tool is to make a cannula on bullets, not cases.
rcmodel
Member in memoriam
As I said, the knurled circle can be applied to the case if the inside of the case is supported, like you I have the bullet knurlier, I could size the case down to below the diameter of the bullet, problem, the case has the appearance of having swallowed a bullet.
I have two 45 ACP that like new, store bought ammo, reloads with visible bullet lines will not feed.
F. Guffey
RetiredUSNChief
Member
Looks like several people already chimed in on the purpose of the cartridge cannelure. Here's a definition I found:
CANNELURE(S) - The circumferential swaged, machined or milled groove(s) around a bullet (for sealing; also often for identification) or cartridge case. Often used to provide visual or tactile identification of special loadings of military ammunition. They are also used to hold lead bullet lubricant.
Source: http://cartridgecollectors.org/?page=glossary
So the case cannelure was used for a variety of reasons, including identifying the type of cartridge.
Here's some more interesting reading on the history of the 30-06 cartridge, which also mentions the cannelure:
http://cartridgecollectors.org/?page=introduction-to-30-06-cartridges
CANNELURE(S) - The circumferential swaged, machined or milled groove(s) around a bullet (for sealing; also often for identification) or cartridge case. Often used to provide visual or tactile identification of special loadings of military ammunition. They are also used to hold lead bullet lubricant.
Source: http://cartridgecollectors.org/?page=glossary
So the case cannelure was used for a variety of reasons, including identifying the type of cartridge.
Here's some more interesting reading on the history of the 30-06 cartridge, which also mentions the cannelure:
http://cartridgecollectors.org/?page=introduction-to-30-06-cartridges
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