FMJ and LRN down the same barrel

[DrHenley]

Originally Posted by Gatorade

I have one of those that came with my 300BLK dies from Lee but I wasn't able to get it adjusted right.

According to Midway, the 300 Blackout FCD is a collet type rifle die.

The rifle FCD is a whole different animal than the pistol FCD. The pistol FCD is a taper crimp die with a "post sizing ring" that insures the loaded case is within specs.


I have rifle FCDs in many different calibers, and it is about the most idiot-proof die ever made. If it is dimensioned correctly and working correctly it is impossible to crush a case, or even to over-crimp, because the shellholder should be pushing on the collet, not on the case. Once the fingers on the collet close, that's as far as you can push the collet into the body.

Take a shell holder, a case, and the FCD and try this:. Put the case in the shellholder and insert the case all the way in the FCD by hand. Does the shellholder contact the collet, or is there brass visible between the shellholder and the collet?