Dillon .223 Dies Question

[Gone Hiking]

I'm using Dillon .223 dies on my Dillon 550. I'm setting the resizing die to have a .223 case fit properly in a Wilson case length headspace gauge. But after seating and crimping a bullet, the now-loaded case then sets a smidge too deep in the case gauge. This only occurs, however, when I'm using PSD brass and 69 grn SMKs. It does not occur with LC brass and 55 grn Hornadys, for example, or with other calibers.

I can't figure out why this occurs. Of course, the easy solution would be to back out the resizing die so the final product will headspace perfectly, but that's a band aid on the real problem. Any thoughts?

 

[Nature Boy]

I use a Dillion .223 dies for all my .223/5.56 rounds for multiple rifles.

Question, how do the rounds in question chamber in the intended rifle?

 

[Gone Hiking]

No issues in the particular AR's .223 CLE match chamber that I've used them in, but I want to load another batch and would like to get the seating or crimping die sorted out so it doesn't increase headspace after the resizing die.

 

[jmorris]

I don’t have any measuring instruments that read in “smidges”, what is the value of a “smidge” in thousandths of an inch?

I ask the question because qualitative terms mean different things to different people. Quantitative values are the same for everyone, why “standards” are not abstract.

If you have the ability to measure to the 4th or 5th point after the decimal, even a relatively large single digit isn’t a big deal.

 

[Blue68f100]

Sort your brass by mfg. Not all brass mfg use the same alloy. This in turn will give you different results when sizing. some are softer and thinner than others. The brass will have a different hardness resulting in different spring back, the reason for the differences.

 

[fastattack]

Call Dillon and ask them. They are there to help.

 

[243winxb]

To much crimp will move the shoulder. Over crimped rounds may even buldge at the shoulder , preventing chambering.

If you have a Dillon taper crimp die, it may contact the case body to much??

Taper Crimp Die
The taper crimp die is also specially configured to center both the case neck and the case body, thereby aligning the entire cartridge for a more uniform crimp. Dillon Rifle Dies are designed to meet the more rigid requirements for both accuracy and precision demanded by today's marksman.
A taper crimp die is preferred for loading ammunition intended to be used in semiautomatic firearms with detachable box magazines, and in lever-action firearms with tubular magazines.

Case trim length should all be the same. RCBS makes a taper crimp die that is more forgiving with different trim lengths.

No crimp needed. I have never crimped for the 223/5.56. The correct neck tension keeps bullets from moving.