Crimping?

[carsonbm]

Why do some brands of 357 bullets have a cannelure and some don't?

How are you suppose to crimp without a cannelure?

I am loading for a rifle with a tube?

How does one know if there will be a cannelure before buying bullets?

I have several books on reloading but, I still don't under the crimping any help sure will be appreciate. I am going to load for a 30-3, 7mm Remington Magnum and a 357, as you can tell i am new at this.

Thanks in advance

 

[SSN Vet]

I'm a total newb but this is what I've found

some web sites only post a generic photo of representative sample of each manufacturers product (i.e. Cabela's)

others post a photo of each individual specimen (i.e. Midway)

what you see is what you get.

 

[TIMC]

From what I have learned you do not have to have a cannelure to crimp and even on bullets with a cannelure you will not nevessarily crimp on it depending on the COAL you want

 

[db_tanker]

the 303 and 7mm Mag will be okay to load without a crimp. HOWEVER, you can actually adjust how a powder burns and how much residue is left in the barrel by adding a crimp to certain powders...this will be knowledge you pick up down the road...


Pistols, OTOH, will require a good crimp. 357 mag, I am guessing, will be in a revolver...therefore you won't have to worry about headspacing off the case mouth. With autoloading pistols, they headspace off the case mouth. 357 Mag has a rim and that is where it headspaces. All you need to worry about is the cartridge Over All Length, OAL. Has to fit in the cylinder.

Lee makes a factory crimp die...it also sizes the finished product to insure perfect fit. I have it set up on a Lee turret press set up for 38 Special and it works like a champ. They are low cost and as easy to use as anything out there.

D

 

[ATAShooter]

You can install your own cannelure if your favorite bullet don't have one on it..

http://www.thehighroad.org/showthread.php?t=252172

 

[The Bushmaster]

Auto loaders----No crimp needed. Just remove the bell. Usually a non-cannelured bullet. Usually headspace on the case mouth. Exception: .357 SIG

Revolvers-------Crimp needed to get a proper powder burn. Usually a cannelured bullet. Headspace on the case rim.

Bolt action rifles-----No crimp needed. Usually non-cannelured bullets. Usually headspace on the case shoulder.

Lever action rifles---Heavy crimp needed. Bullets will have a cannelure. Usually headspace on the case rim (Unless you have an old Mod 94, like mine, that has to have the shoulder moved forward to keep the primers from backing out).

There are several exceptions to the above rules. All bullets above pertain to Jacketed bullets as that's all I load.