Well, here you go. Its kinda confusing and frustrating.Keep us posted on the results!!
The filed down shellholder works. I can make brass that passes the case gauge. However, I have discovered other issues.
If I run a case through either the Lee or CH4D die with a unmodded shellholder, then the case has too much headspace. But if I run one case through both dies, then it has almost too little headspace. So I am not really sure whats going on there, yet.
Additionally, it seems that I have to size the brass closer to the minimum headspace according to the case gauge in order for it to chamber in my rifle. I headspaced my rifle using go and no-go gauges.
So I not sure what the ultimate issue is. I don't know if its just people using different tolerances, or maybe its the Starline brass I am using, or maybe I am missing something. I will keep working on it. Bottom line is that I can at least make ammo that will work for my rifle. I might try to get some commercial ammo and see how that runs in my rifle.
Why can't any of my projects be simple.