.38-55 has got me stumped - Page 2

daveinvegas · 02-09-2010, 07:13 AM

Yep, it's to prevent bullet set back. Just for info, on a .45-70 round, 70g of black powder goes up to that ring/cannelure. I think that may be a coincident.

When you fire the round that cannelure will be blown out against the chamber walls and almost disappear.

If you are determined to to have it you can buy a machine from corbins for about $700. Hardly seems worth the effort.

An old guy once told me that the cannelure was to show how far the bullet was to be seated.

While it might look that way on some cartridges I really don't think that was the purpose.

I'm sticking with the preventing set back reason. Besides, it would certainly depend on the bullet weight.

An older Speer loading manual (#9) indicates that it is also used for identification but doesn't say how.

I have an old .45-70 round with a long, heavy bullet (looks to be 500g) that is seated almost all the way to the case cannelure. It must be to prevent that heavy bullet from seating itself deeper into the case during recoil.

I have another .45-70 round with a shorter, lighter bullet (maybe 350g?) and the cannelure is located much closer to the case mouth.

I don't see how loading dies could possibly put a cannelure on the case.

If you are going to use a pipe cutter to place a cannelure in the case I would definitely blunt the cutter so you don't actually cut the case.

http://www.corbins.com/pr-4070.htm

rat907 · 02-09-2010, 04:04 PM

Quote:

Originally Posted by daveinvegas

An older Speer loading manual (#9) indicates that it is also used for identification but doesn't say how.

That was a idea I was gonna throw out there also.

Since there was also simular rounds available in 1884-1939 that could be confused with the 38-55.

ChameleonCamo · 02-09-2010, 05:44 PM

not going to use a pipe cutter to try and replicate the groove its just what it looks like to the eye...awesome to know that the newer reloading manuals dont have this info in there contents.

02-09-2010, 07:13 AM	#11
daveinvegas SHARK Join Date: Nov 2009 Location: secret location in the Nevada desert Posts: 486	Yep, it's to prevent bullet set back. Just for info, on a .45-70 round, 70g of black powder goes up to that ring/cannelure. I think that may be a coincident. When you fire the round that cannelure will be blown out against the chamber walls and almost disappear. If you are determined to to have it you can buy a machine from corbins for about $700. Hardly seems worth the effort. An old guy once told me that the cannelure was to show how far the bullet was to be seated. While it might look that way on some cartridges I really don't think that was the purpose. I'm sticking with the preventing set back reason. Besides, it would certainly depend on the bullet weight. An older Speer loading manual (#9) indicates that it is also used for identification but doesn't say how. I have an old .45-70 round with a long, heavy bullet (looks to be 500g) that is seated almost all the way to the case cannelure. It must be to prevent that heavy bullet from seating itself deeper into the case during recoil. I have another .45-70 round with a shorter, lighter bullet (maybe 350g?) and the cannelure is located much closer to the case mouth. I don't see how loading dies could possibly put a cannelure on the case. If you are going to use a pipe cutter to place a cannelure in the case I would definitely blunt the cutter so you don't actually cut the case. http://www.corbins.com/pr-4070.htm __________________ But when a long train of abuses and usurpations, pursuing invariably the same Object evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new Guards for their future security. "I'm mad as hell and I'm not going to take this anymore!" Be polite, be professional, but have a plan to kill everyone you meet.

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02-09-2010, 05:44 PM	#13
ChameleonCamo long range ginger Join Date: Feb 2010 Posts: 303	not going to use a pipe cutter to try and replicate the groove its just what it looks like to the eye...awesome to know that the newer reloading manuals dont have this info in there contents.