Lee Factory Crimp vs Taper Crimp die ?

[Erocksmash]

Here's what a Lee factory crimp die does to a .357

I have no example of the other

 

[gwpercle]

To try and shed a little more light on the subject :
1.) Taper Crimp dies are usually used on semi-auto rounds , 9mm Luger, 40 S&W , 10mm Auto , 45 acp . etc. And on bullets with smooth sides with no cannelure or crimp groove . These rounds seat on the case mouth and can't be roll crimped .

2.) Roll Crimp usually used on bullets that have a cannelure or crimp groove made into the bullet like revolver bullets , they seat on a rim so the case mouth can be rolled into the cannelure or crimp groove provided . Too much roll crimp and the case will bulge out so you have have to learn how to properly adjust them .

3.) Lee Factory Crimp Die . This was invented by Richard Lee to sell to those who had trouble getting a proper roll crimp or taper crimp by adjusting the crimp die that comes with a standard die set...some think they are wonderful ... I never had a need for them , I learned how to adjust crimp dies 50 years ago .

Gary

 

[Autonomous]

I quit using the FCD because it was resizing my .452" lead .45 ACP bullets down to .451".

 

[stansdds]

I have never used a Lee FCD, the idea of resizing the case after the bullet is seated and possibly undersizing the bullet in the process never appealed to me. For me, I roll crimp revolver cartridges and taper crimp semi-auto pistol cartridges using a separate crimping die. Seating and crimping in the same step can work, but I find that using a separate die works better.
Your mileage may vary.

 

[boatbum101]

The only use I've found for a Lee FCD is resizing my 38 Spcl wadcutter cases . I decap & then run them through a FCD that I removed the innards from . Just die body & carbide ring . Works this thin walled brass less than FL resizing . Barely bell case mouth & I can seat even the .359 Rem HBWC's , finish with a light taper crimp to .371 . I do this for my 38 target revolvers 2 Colt OMM & a PPC gun built on a Model 10 . All these have faster twist barrels for stabilizing the 148 HBWC & are capable of 10 ring accuracy @ 50yds . Same cases shot in the same guns . Low pressure loads in the 9 to 10K psi range exceptional accuracy & cases last forever .

 

[38SPL HV]

I use a Lee taper crimp on NOE Keith SWC's on forward driving band to meet published 1.553" OAL in 357 Mag cases. Crimping in crimp groove will not allow them to fit in my SP101 so I taper crimp on the bullet's front band. The bullets do not move upon recoil in either my SP101 or Ruger Blackhawk with 1/2 turn of the Lee taper crimp using my standard magnum load of 12.0 grs 2400...