Lee Facory Crimp on 550 Dillon Question

[Fuzz]

Just added a Lee Factory Crimp Die for 40 S&W using sns .400 180 flat point. N320 @ 4.8 gr.

 

I answered my own question and figured it out.

 

I have been running all my 40 cal casings through the GRX resizing die for a couple years now. When I would plunk test them in the Shockbottle I would get anywhere from 2 -  6 that would not pass. I would use them for practice and they always fired.

 

I decided to try the Lee Factory Crimp Die and just ran a couple hundred through. When shockbottled these were now 100% not one failure. Next step is the accuracy test.  Impressed with Lee FCD

Edited December 29, 2018 by Fuzz
problem solved

[Fuzz]

Never Mind  I figured it out. Something was catching. It goes all the way down.

[Postal Bob]

I use nothing but the Lee sizing die and FCD. I also use 180 gr FP. They all pass the gauge test, but some occasionally do not chamber completely in my 1911 gun. The problem is that some of the bullets have a miniscule amount of extra coating right on the egde where the ogive starts. Sort of like run in a painted wall. Combined with a very tight chamber, these do not chamber. But they work fine in my limited gun, which has an extended chamber.

[MemphisMechanic]

@Postal Bob is there an extra thick spot of coating applied by the bulletmaker, or is there a tiny bit of peeled off / shaved coating at that point after the round is seated & crimped?

[Postal Bob]

It's the bullet coating having a high spot. Like stated, they work fine in my limited  gun which has the long chamber. But my 1911 has a very tight chamber. 

Edited December 31, 2018 by Postal Bob