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Do I need a taper crimp die for either 9mm or. 45 acp? I believe I know what a crimp does but feel free to explain the pros/cons of crimp or no crimp.
Would it work in a hornady press?Taper crimp will work well, but the LEE factory Crimp die is an order of magnitude better.![]()
No.Anybody else recommend lee factory crimp dies?
Yes. I have them for each caliber I reload.Anybody else recommend lee factory crimp dies?
I will keep this relevant to 9 mm & .45ACP. As far as the actual crimping itself goes, it does the same taper crimp as any other taper crimp die. Additionally, the Lee FCD essentially full length sizes the completed cartridge as well.So what's the difference between factory crimp and taper crimp?
Canneluring is supposed to help resist setbacks (see my article on Setback). Factory canneluring is used on both of the cartridges that I studied, Hornady Critical Defense 9mm and Federal HydraShok 45ACP.with taper crimping, after you size a case measure the outside diameter of the case mouth. then when you setup you crimp die only crimp enough to return the outside diameter to the measurement you took. crimping more than that will actually cause the bullet to loosen in the case and setback creating overpressure and possible kabooming your gun.
taper crimp is for removing the case mouth bell only. it is NOT for pressing the case mouth into the bullet.
the other type of crimp is roll crimping and those dies are used with cannelured bullets to roll the rim of the case slightly into the cannelured ring around cannelured bullets. never ever use a roll crimp on a cartridge like 45acp 40sw 9mm etc that spaces of the case mouth.
you dont cannelure a bullet during the loading process. a cennelure is created when the jacket is created. i dont use my lee dies to create a cannelure and i always crimp as a seperate step. if you try and create a cannelure as a secondary step you can cause jacket seperation on firing as the bullet exits the muzzle.Canneluring is supposed to help resist setbacks (see my article on Setback). Factory canneluring is used on both of the cartridges that I studied, Hornady Critical Defense 9mm and Federal HydraShok 45ACP.
Is there a difference between the way the factory cannelures and the roll crimp you mentioned? I've started to look into reloading based on the latest ammo availability crisis, but know very little about it at this point. I'd like to be able to cannelure if it is possible and safe.
OK, if I understand it right, the canneluring is the ring of ridges around the bullet. Some amount of crimping of the casing around the ring of ridges is what helps the cartridge resist setback. Excessive crimping can actually create problems with overpressure or with the bullet tumbling after leaving the barrel.you dont cannelure a bullet during the loading process. a cennelure is created when the jacket is created. i dont use my lee dies to create a cannelure and i always crimp as a seperate step. if you try and create a cannelure as a secondary step you can cause jacket seperation on firing as the bullet exits the muzzle.
dont over crimp. a cartridge doesnt need a death grip to function in most semi-autos. cannelures are needed in belt fed machine guns too keep bullets from being extracted during loading. cannelures are also used in heavy recoiling rounds or tube fed firearms like lever guns.
Yes, lee factory crimp will work with any standard pressWould it work in a hornady press?