It had a brass rimless case with a bullet-seating
cannelure, and was loaded with a 230-grain, cupronickel-jacketed bullet traveling at 800 fps.
These were necked down to 7mm and loaded with a 7mm bullet whose crimping
cannelure was closer to the bullet's base then was usual.
A few forming operations later--steps that give a particular curve to the nose, punch in any hollow point, possibly press a
cannelure around the waist and then usually a final sizing--you'd have a finished bullet.
If the bullet can be inserted up to the case neck or
cannelure on the bullet the barrel is excessively worn and needs to be replaced.
<< Des chasseurs de la fin de l'age glaciaire dans la region du lac Megantic : decouverte des premieres pointes a
cannelure au Quebec.
Corbin Manufacturing bring high-performance bullet seating to the hobby reloader with their Hand
Cannelure Tool.
Always crimp into the bullet
cannelure but just enough to slighdy taper the case mouth."
When it began to yaw, the long 77-grain bullet broke apart at the
cannelure and ultimately into four pieces--base, copper nose jacket, and two pieces of lead, all of which penetrated at least 10 inches.
Consequently all .38 WCF bullets--whether lead alloy or jacketed--must have a crimping groove (lead alloy ones) or knurled
cannelure (jacketed ones).
There is a
cannelure surrounding the bullet jacket a bit back from the nose.
The Super Hammerhead bullet is a bonded bullet that has a thick
cannelure. It has all the markings of a superb hunting bullet.
However, after from 2 to 6 inches of penetration, both the M193 (Vietnam era) and M855 (current) full metal jacket (FMJ) projectiles will yaw to 90[degrees], flatten and break apart at the
cannelure (crimping groove).
