Walkalong said:
adjust the sizer die down to make sure it is just barely missing the shell holder or shell plate when actually sizing a case, not just by running it up there with no case.
Ccctennis said:
I'm a rookie to progressive reloading but damn I tried every possible adjustment to no avail???
Ccctennis, Walkalong's post brought something else to mind.
Since you are new to progressive reloading, let me explain the shell plate tilt/deflection which may be contributing to your situation that you won't experience with single stage reloading.
As Walkalong posted, when you initially adjust dies without cases or just one case, shellplate tilt will be different than when all the stations are full of cases as they apply different amount of force on the dies/shell plate. Shell plate tilt/deflection will affect your initial die adjustments which may result in not fully resized brass and variance in OAL/COL (and due to these reasons, some of us use pre-resized cases for progressive reloading for more consistent loads).
Although I initially adjust my resizing die without a case, when I am doing my initial QC runs with all stations full of cases, I will recheck the top of upstroke of the ram to make sure I do not see daylight between the bottom of the die mouth and the top of the shell plate. As posted, overly expanded +P loads/NATO pressure spec rounds will require more effort to fully resize and if the resizing die is not adjusted down further, it won't fully resize and not pass the gauge or the barrel.
Yes, the reason why the resized case passed the gauge/barrel initially is because you made sure it was fully resized (by itself). With the stations full of cases, recheck the resizing die and see if you see any daylight. If you see daylight, readjust the die down so you don't see daylight. The resized case now should pass both the gauge and barrel. If they do, your finished rounds loaded to working/max OAL/COL and .376 - .378" taper crimp should pass the gauge/barrel. I posted earlier for you to test OAL of 1.125" with taper crimp of .376" because 1.125" should clear the start of rifling for most barrels regardless of ogive or bullet nose shape and .376" is the maximum taper crimp I use with plated bullets (I will also use .377"-.378" depending on the brand as diameter sizing differs from .355" to .3555"/.356").
Let us know if this helps.