Canellures do effect accuracy. It was one of the reasons sierra did not want to add a canellure to the matchking for mk262 mod1. The canellure they did use is almost non existant. The debate over crimping, and whether it degrades or enhances accuracy will go on forever.
Full Answer
What is the purpose of a cannelure on a bullet?
Function. In the Minié ball the purpose of the cannelure is to hold a lubricant. Cannelures for this purpose are commonly called "grease grooves" or "lubrication (lube) grooves" or just "grooves" by bullet casters (see the glossary of firearms technical terminology maintained by SAAMI).
Do you have to crimp cannelure bullets?
It must be clearly understood that a cannelure is essential to obtain good results with a roll crimp. Remember, bullets that do not have a cannelure but need to be crimped should be given a taper crimp. Taper crimping is the best choice for any firearm which headspaces on the case mouth.
Why do you crimp bullets?
And, because of recoil, the bullet needs to be firmly crimped to keep it from moving and thereby altering the length of the cartridge. Finally, as a general rule for any hunting ammunition, I like to crimp the bullet if there is a cannelure in the right place (some bullets have more than one).
Is factory ammo crimped?
A commonly used tactic in a factory round is a crimp to help hold the bullet in place before it's launched, especially when there is a heavy bullet and heavy recoil. If you get a hold of some 7.62 x 51 NATO military brass that you intend to reload, you will find that the primers and bullets were crimped in place.
What is a cannelure in reloading?
1:554:46Reloading Principles: Cannelure... What is it and what does it do?...YouTubeStart of suggested clipEnd of suggested clipGoing on not a lot of crimp. But the bullets with candle or it's completely different they haveMoreGoing on not a lot of crimp. But the bullets with candle or it's completely different they have little striations that look just like. This. And what that allows is the Kremp to come in and cut into
What is meant by Cannelure?
Definition of cannelure 1 : a groove running lengthwise on the surface of a cylinder or column. 2a : a groove around the cylinder of an elongated bullet for small arms to contain a lubricant. b : a groove around a bullet into which the edge of the cartridge case is crimped.
What is a roll crimp?
Roll Crimping overview and info. Roll Crimping. Crimps, whether folded in the classic six or eight point "pie" shape – so named for the visible triangular segments – or rolled serve the same purpose for a shotshell: Crimps are to. Contain the load within the confines of the shell.
What is a factory crimp in reloading?
Lee Factory Crimp Die crimps your bullets in place the same as factory ammo. A collet gently, but firmly squeezes the very end of the case into the crimping groove, exactly the same as factory ammo. Gives a segmented straight crimp, and crimps more firmly than any other tool.
What is crimp in cartridge?
Crimping is the folding or bending of the case mouth to grip the bullet. For conventional bullets, this is a relatively simple operation because the case diameter is larger than the bullet diameter. A simple die with an internal shoulder can form the crimp quickly. Crimped cartridge.
What should be marked on a test fired bullet that is propelled by a licensed firearm?
The firearm must be recovered and submitted with any unfired cartridges found at the crime scene. Fired bullet should be marked by means of a stylus or pointed instrument by the recovering officer with his initial, or the initials of the victim/suspect, on the nose or its anterior portions.