bullets with cannelure

[DsrtRat]

Can someone explain this to a soon to be rookie reloader? What is the purpose of a cannelured bullet? Do you need a crimping die to use them? Could you neck size brass and use a cannelured bullet?

Thanks

 

[IM_Lugger]

Regular dies will be fine. Just make sure the case/neck ends at the cannelure.

 

[Ice-Pick]

I believe

I believe the idea was to give you somewhere to crimp to help seal the cartridge from the elements. I think it was mostly a military thing to start.
Like sealing the primers in.

M.

 

[senior]

It just provides a place to crimp the bullet.
It is not needed in most rifles as neck tension will hold the bullet.
It's just there so if you want to crimp, & there are cases where you might,, a special crimpimg die is not required.

 

[Ganderite]

Think of it as a dotted line so the rookie loader knows how deep to seat the bullet. Works for ncked size and FL sized brass.

 

[Mighty Peace]

I bought a few hundred Accubonds (30 cal 180gr) with the cannelure that were orange tipped (production run for Norma factory ammo). Works great...no different than the Accubonds with the white tip and no cannalure.

As mentioned use it as your guide for bullet seating. For me, I seat my bullets out more - with the tips almost touching the inside of the clip on my Sako m75ss 300WM.

 

[MTF]

In addition to the comments already posted, I would add that crimping a bullet into a case using a cannelure helps prevent setback of the bullet into the case in hard recoiling cartridges. It usually doesn't have to be done if a special die is used to taper-crimp for autoloaders or roll-crimp for revolvers. In any case, if canneluring a finished cartridge, a special tool is used which has nothing to do with the dies.

 

[Lefty Dick]

As a rookie reloader I would recommend you purchase at least 2 up to date reloading manuals.
I personally find the Speer manual to be one of the best for explaining stuff that you asked here.

Good luck.

 

[DsrtRat]

Thanks for the info guys. I love the wealth of info on this site!

 

[JEC]

I have shot cannelured bullets seated close to lands which resulted in the cannelure being completely exposed in front of the csae neck..with no problems. The cannelure length is pretty long, as it is not designed to fit a particular chambering, and consequently can fit almost all common chamberings regardless of neck length.

 

[bisonhd]

May also help crimp the bullet jacket to the core. There's bullets with two canures, or in he Hornady 180 sp, a crimped canure with a fine line just above it.

 

[ben hunchak]

Actually I've heard more of the opposite, the cannelure can help the jacket separate from the core as the jacket is weakened at that spot.

 

[Starscream]

Can someone explain this to a soon to be rookie reloader? What is the purpose of a cannelured bullet?
The cannelure is to let the bass be crimped into the bullet, it helps keep a bullet's seating as well as seals the interior of the bullet from moisture like rainfall from entering and contaminating the powder


Do you need a crimping die to use them?
Yes you do, but whether you should or not is entirely dependent on the round you're reloading and personal taste. Pistol bullets generally need to be crimped as a last stage but they don't neccessarily need a cannellure.

For bottle necked rifle bullets it's questionable. The Lee reloading manual states that there is no accuracy benefit for crimping and a cannelure, and my own observations tend to support that. I still do a very light crimp before I store the loaded bullets though, depending on how rough I expected transport to be. Admittedly I think that's more out for peace of mind then actual measurable benefits.




Could you neck size brass and use a cannelured bullet?
Yes, a cannelured bullet is the exact same diameter as any other of the same caliber.

Answered as best I can for you

 

[tjhaile]

You can either set up your seating die to crimp as it seats the bullet or use a separate crimp die. There are only a few cases where you really need to crimp rifle ammunition:

1. Semiautomatic rifles
2. Tube magazines
3. Heavy recoiling rifles from .375 calibre on up

The Lee Factory Crimp die does allow you to crimp lightly into the jacket of a bullet with no cannelure.

 

[senior]

Originally Posted by DsrtRat View Post

Do you need a crimping die to use them?
Yes you do, but whether you should or not is entirely dependent on the round you're reloading and personal taste. Pistol bullets generally need to be crimped as a last stage but they don't neccessarily need a cannellure.

Don't mean to be picky but just why do you need a "crimping die" to use cannellured bullets
Pretty much ALL Seating dies will crimp with an additional 1/2-3/4 turn of the die.


Reapeded from above poster

The Lee Factory Crimp die does allow you to crimp lightly into the jacket of a bullet with no cannelure.

 

[Madrod]

Attention should be paid to cut your cases to all the same length for consistent crimp pressures.Cases that head-space on the neck (9mm,.45 acp. ect.)must not be crimped.Reloading takes shooting to a whole new level of fun when your ammo doesn't cost you an arm and a leg.

 

[Starscream]

Reloading takes shooting to a whole new level of fun when your ammo doesn't cost you an arm and a leg.

Oh it still costs the same, an arm and a leg. Just that you end up shooting a LOT more bullets then you normally would have.

 

[tjhaile]

Cases that head-space on the neck (9mm,.45 acp. ect.)must not be crimped.

Actually, cases like this are taper crimped instead of roll crimped. At the minimum, it is necessary to get rid of the expansion at the case mouth.

 

[neotekz]

Can someone explain this to a soon to be rookie reloader? What is the purpose of a cannelured bullet? Do you need a crimping die to use them? Could you neck size brass and use a cannelured bullet?

Thanks

the pic in your signature is very distracting...it took me 2 mins to read your post and now im to distracted to answer your questions who is that in the pic?

 

[Marlin375]

if canneluring a finished cartridge, a special tool is used which has nothing to do with the dies.

...

You lost me here.

Every seating die I have ever used has the ability to crimp the case mouth if you set it up to do so.

A crimp on the cannalure is very important for some cases, particularly for a 45-70 with heavey bullets, heavey recoil, and a tubular magazine when the cartridges are end to end.

In my experience just because there is a canalure present does not mean that you have to use it, lots of 30 cal bullets come either with or without and I think the COL is more importantly set by your gun than by the canalure.
But I am no expert.