What's the deal with the line on the side of mil 45 acp?

black_hog_down · March 4, 2018, 05:14 PM

This is Olin 45 acp. Got it from an estate sale. What's the deal with the line on the side and can it be reloaded? Thanks.

locknloader · March 4, 2018, 05:24 PM

Not sure what it means but i have reloaded 9mm cases with this no issue.

mehavey · March 4, 2018, 06:08 PM

Crimp line.
Reload away.... !!!

FlyFish · March 4, 2018, 06:17 PM

It's called a cannelure, and it's intended to prevent the bullet from being pressed further into the case. Has no effect on reloadability.

Sharkbite · March 4, 2018, 06:28 PM

^^^ THIS ^^^

Nick_C_S · March 4, 2018, 10:26 PM

^^ That ^^

locknloader · March 5, 2018, 06:57 AM

I thought cannelure was the little ringed line on the bullet itself that you are supposed to crimp in the middle of?

FlyFish · March 5, 2018, 07:25 AM

Quote:

I thought cannelure was the little ringed line on the bullet itself that you are supposed to crimp in the middle of?

Yes, that's a cannelure also.

mehavey · March 5, 2018, 07:25 AM

Actually, a cannelure is a groove line around any cylindrical object -- be it bullet or case in this instance.

Since an autoloading pistol cannot be roll-crimped, the crimp to prevent bullet setback is a cannelure in the case to form a slight shelf at the bullet's base.

**Unclenick** · March 5, 2018, 10:58 AM

IIRC, the root word for cannelure is an old word meaning channel, so you could put a cannelure in a wood dowel rod if you wanted to, though, in non-firearm terminology it usually means a length-wise groove in a rod or cylinder or column. Incidentally, the exactor groove in a case is also sometimes called a cannelure (see the glossary on SAAMI's site).

mikld · March 5, 2018, 11:52 AM

^Yep^ Not a dedicated reloading term. It just means an imprinted groove around a cylindrical object. Possible an old machining term?

jamaica · March 5, 2018, 12:59 PM

Interesting responses. Thanks black_hog_down for asking the question.

robhic · March 5, 2018, 03:08 PM

Quote:

Not sure what it means but i have reloaded 9mm cases with this no issue.

Same here. I run into those from time to time in 9mm. I thought they were decorative!

So I learned something.

**Unclenick** · March 5, 2018, 03:39 PM

Yes. That kind of brass cannelure doesn't thin the brass enough to cause a problem because it is located where the brass expands against the chamber for support. Pressing against the side of the chamber will tend to iron that cannelure out, so it loses its functionality after the first pass, but does not harm.

gwpercle · March 5, 2018, 04:52 PM

The cannelure on the case at the base of the bullet also helps to keep the bullet from being driven back in auto loading weapons.
The round headspaces on the mouth so you can't put a heavy crimp there...sort of a back up to a taper crimp.

I thought I was looking at a vertical crack in the side of the case but it could be the lighting....look at the case just above his ring , appears to run from the extractor cut to just above the cannelure . Anyone else see that ?

black_hog_down · March 5, 2018, 08:11 PM

Quote:

Originally Posted by gwpercle

The cannelure on the case at the base of the bullet also helps to keep the bullet from being driven back in auto loading weapons.
The round headspaces on the mouth so you can't put a heavy crimp there...sort of a back up to a taper crimp.

I thought I was looking at a vertical crack in the side of the case but it could be the lighting....look at the case just above his ring , appears to run from the extractor cut to just above the cannelure . Anyone else see that ?

I see it. Just a reflection I think.
They are new unfired rounds.

March 4, 2018, 05:14 PM	#1
black_hog_down Senior Member Join Date: May 13, 2016 Posts: 111	What's the deal with the line on the side of mil 45 acp? This is Olin 45 acp. Got it from an estate sale. What's the deal with the line on the side and can it be reloaded? Thanks.

March 4, 2018, 06:17 PM	#4
FlyFish Senior Member Join Date: January 20, 2009 Location: Overlooking the Baker River Valley Posts: 1,723	It's called a cannelure, and it's intended to prevent the bullet from being pressed further into the case. Has no effect on reloadability. __________________ NRA Benefactor Life Member NRA Certified Instructor: Rifle, Pistol, Shotgun, PPIH, Metallic & Shotgun Shell Reloading; RSO Pemigewasset Valley Fish & Game Club

March 4, 2018, 10:26 PM	#6
Nick_C_S Senior Member Join Date: March 21, 2013 Location: Idaho Posts: 5,525	^^ That ^^ __________________ Gun control laws benefit only criminals and politicians - but then, I repeat myself. Life Member, National Rifle Association

March 5, 2018, 10:58 AM	#10
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,063	IIRC, the root word for cannelure is an old word meaning channel, so you could put a cannelure in a wood dowel rod if you wanted to, though, in non-firearm terminology it usually means a length-wise groove in a rod or cylinder or column. Incidentally, the exactor groove in a case is also sometimes called a cannelure (see the glossary on SAAMI's site). __________________ Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle

March 5, 2018, 11:52 AM	#11
mikld Senior Member Join Date: February 7, 2009 Location: Southern Oregon! Posts: 2,891	^Yep^ Not a dedicated reloading term. It just means an imprinted groove around a cylindrical object. Possible an old machining term? __________________ My Anchor is holding fast! I've learned how to stand on my own two knees...

March 4, 2018, 05:24 PM	#2
locknloader Senior Member Join Date: August 28, 2017 Posts: 164	Not sure what it means but i have reloaded 9mm cases with this no issue.

March 4, 2018, 06:08 PM	#3
mehavey Senior Member Join Date: June 17, 2010 Location: Virginia Posts: 6,903	Crimp line. Reload away.... !!!

March 4, 2018, 06:28 PM	#5
Sharkbite Senior Member Join Date: November 4, 2013 Location: Western slope of Colorado Posts: 3,679	^^^ THIS ^^^

March 5, 2018, 06:57 AM	#7
locknloader Senior Member Join Date: August 28, 2017 Posts: 164	I thought cannelure was the little ringed line on the bullet itself that you are supposed to crimp in the middle of?

March 5, 2018, 07:25 AM	#9
mehavey Senior Member Join Date: June 17, 2010 Location: Virginia Posts: 6,903	Actually, a cannelure is a groove line around any cylindrical object -- be it bullet or case in this instance. Since an autoloading pistol cannot be roll-crimped, the crimp to prevent bullet setback is a cannelure in the case to form a slight shelf at the bullet's base.

March 5, 2018, 12:59 PM	#12
jamaica Senior Member Join Date: March 24, 2006 Location: Northern Utah Posts: 705	Interesting responses. Thanks black_hog_down for asking the question.

March 5, 2018, 03:39 PM	#14
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,063	Yes. That kind of brass cannelure doesn't thin the brass enough to cause a problem because it is located where the brass expands against the chamber for support. Pressing against the side of the chamber will tend to iron that cannelure out, so it loses its functionality after the first pass, but does not harm. __________________ Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle

March 5, 2018, 04:52 PM	#15
gwpercle Senior Member Join Date: November 30, 2012 Location: Baton Rouge, Louisiana Posts: 1,752	The cannelure on the case at the base of the bullet also helps to keep the bullet from being driven back in auto loading weapons. The round headspaces on the mouth so you can't put a heavy crimp there...sort of a back up to a taper crimp. I thought I was looking at a vertical crack in the side of the case but it could be the lighting....look at the case just above his ring , appears to run from the extractor cut to just above the cannelure . Anyone else see that ?