Might be a stupid question.........
- Thread starter McHoss
- Start date
Thanks! I figured it was along those lines.
By definition the cannelure can be in either; "A cannelure is a groove or channel around ammunition, either bullets or cartridge cases. The cannelure may be pressed into or cast with the bullet or case."
In this case it is used to crimp the bullet in place, and can also serve as an identifier. These cases can cause difficulties when reloading, but the cannelure tends to iron out after several reloads.
A case cannelure can interfere with seating the bullet, may bulge enough to cause chambering issues, may contribute to variations in bullet pull, or may have no adverse effects at all. As a rule of thumb, IMO, avoid using them if you have a choice. I'm pretty sure that this does stress the case, but in my experience, I've never had a cannelured case fail at the cannelure.
I have about 500 nickel plated 38 Spl cases, all with cannelures, that I load for my "66 Yellow Boy. The brass is probably 40 years old and I've loaded them probably 5 times. I've had no issues, but the shop that sold them to me wouldn't load them for customers.
I examined a case under a magnifier and it looks like the cannelure is pressed and rolled into the case, like knurling. I'm assuming this occurs after the case is loaded.
Last edited:
Yes, I know the reason for crimping brass.
A cannelure is a "groove". I don't see a groove either in your picture or the OP's. In both your picture and the OP's the case has been crimped after the bullet was seated.
A cannelure is a "groove". I don't see a groove either in your picture or the OP's. In both your picture and the OP's the case has been crimped after the bullet was seated.
Last edited:
Below from the SAAMI Glossary of Industry terms
https://saami.org/saami-glossary/?letter=C
CANNELURE
1. A circumferential groove generally of corrugated appearance cut or impressed into a bullet or cartridge case.
And as stated above the cannelure on the case keeps the bullet from moving under recoil.
https://saami.org/saami-glossary/?letter=C
CANNELURE
1. A circumferential groove generally of corrugated appearance cut or impressed into a bullet or cartridge case.
And as stated above the cannelure on the case keeps the bullet from moving under recoil.
Last edited:
I have never had any issues reloading cases with cannelures on them.
They are applied to either bullet or case with a special type of knurling tool. You can even get hand tools to make your own: http://www.corbins.com/hct-1.htm
Some cartridges have also used a crimp consisting of a number of indentations applied on the side of the case neck instead of at the mouth, as can be seen in this drawing of the .303 Mk VII:
They are applied to either bullet or case with a special type of knurling tool. You can even get hand tools to make your own: http://www.corbins.com/hct-1.htm
Some cartridges have also used a crimp consisting of a number of indentations applied on the side of the case neck instead of at the mouth, as can be seen in this drawing of the .303 Mk VII:
Yes, crimped by placing a cannelure around the brass with a knurling tool.That brass has been crimped.
Last edited:
Yes, the brass has been crimped, with a crimping tool.
