Jump to content
Brian Enos's Forums... Maku mozo!

40 sw taper crimp die


22h2
 Share

Recommended Posts

Lee markets two different Factory Crimp Dies (FCD) one for pistol calibers and another for rifle calibers.  The design of the dies is also very different.  These two factors (perhaps there are others also) leads to a lot of confusion when crimp dies are discussed, especially the Lee brand.

 

Rifle FCD                    Pistol FCD

30-06_factorycrimp.jpg38_FCD.jpg.fcbc138d08e40a72474d53aa37520154.jpg

Edited by muncie21
Link to comment
Share on other sites

@22h most seating dies that I've used can also be adjusted to crimp/de-bell/remove taper in the same station.  While this can be done, it's more straight forward/simple to seat in one station and remove the bell/crimp in a separate station. Since I seat and crimp/de-bell in two station, I really can't help with your specific issue.

 

There are people that do this, so don't give up hope, it may just take some time as most folks I know use 2 separate stations for these activities.  Good luck!

Edited by muncie21
Link to comment
Share on other sites

If you want to seat and crimp with one die.  You have to about it in a roundabout way. First back the die body out till it will not crimp. Seat 10/20 bullets into cases at your length. Then remove the seating assembly. How start lowering the die body till you get the crimp you desire. Lockdown the die. Reinstall the seating assembly using the remaining seated rounds . How try a new case to seat and crimp at the same time.           It's best to use two dies but it can be done with one.

 

Link to comment
Share on other sites

10 hours ago, 22h2 said:

Hey Ahi, I have done that process but apparently the Rcbs die crimps before final seating it creates a ring around the bullet, it’s only with lead or coated, the jacket bullets are fine. 

Back entire die out a 1/4 turn, then screw the seater in a 1/2 turn. Check ur OAL at that point.
Also, are you using bullets with a crimp groove or smooth wall.  Seems like the 1 die method would go better with bullets with the groove.

Link to comment
Share on other sites

Thanks Joe4d, I will try this, my process was seat the bullet, back the seat stem off, developed crimp then use the existing cartridge to adjust the oal, it works well with that cartridge but the next one not so much. I’m loading on a rl550

 

thanks 

Link to comment
Share on other sites

On 9/20/2020 at 5:31 PM, AHI said:

If you want to seat and crimp with one die.  You have to about it in a roundabout way. First back the die body out till it will not crimp. Seat 10/20 bullets into cases at your length. Then remove the seating assembly. How start lowering the die body till you get the crimp you desire. Lockdown the die. Reinstall the seating assembly using the remaining seated rounds . How try a new case to seat and crimp at the same time.           It's best to use two dies but it can be done with one.

 

This is the answer, right here. It actually takes longer to explain than it does to do.

Link to comment
Share on other sites

  • 2 weeks later...

The newer seat/crimp dies seem to have a much longer taper on them than the older (80’s) dies. The older ones did the taper crimp at about the last .100 -.200 of ram stroke whereas the newer ones are more of a gentle taper right at the start. It makes for better alignment but also makes single seat/crimp more difficult. At least that’s what I’ve found between my old and newer dies. 

Link to comment
Share on other sites

  • 3 months later...
On 9/20/2020 at 4:24 PM, muncie21 said:

... it's more straight forward/simple to seat in one station and remove the bell/crimp in a separate station...

 

Amen to this.  I did tens of thousands of rounds of .40 S&W with RCBS dies. 

 

They worked fine, but I always found it a PITA to make adjustments, and the lube on lead bullets constantly jammed up the seating die and then changed my seating depth, and cleaning it was another PITA. 

 

I went to Dillon dies and never looked back...  I sold my RCBS dies. 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...