I’m the OP. My Sinclair concentricity showed up this afternoon. I’ll list my results, but if you just want the summary, my RCBS FL dies seem fine. The Lee collet are better, and my problems seem to be from seating.
My Kreiger on the Rem and the Tikka both have the fired cases come out with right around .001, but my AR-15, which is really accurate, has the fired cases come out much larger. I wonder if my chamber has a problem? I’ll list those cases further down.
I tightened the little nut on the seating stem, but what’s the next step? The dies are clean on the inside, what else can I do to them? Should my next purchase be the Tru-angle tool to straighten the mistakes, or should I skip to a comp. bullet seater?
I started with the 308 I started the thread with. The cases I used with the three rifles had been checked through the neck sorting tool first.
The fired cases had .001 or really close to it.
I’ll list two numbers. The first number is the run out after FL sizing (bumping the shoulder .001), the second number is the same case, but with the measurement taken on the seated bullet.
My dial goes to .001, so when I list to the 4th place, I’m guessing from looking at the needle between the marks. I’m rounding to the half.
Case #1 .0025, .0035
#2 .0025, .009 (That one would probably ruin my group!)
#3 .003, .002
#4 .0025, .003
#5 .003, .0025
#6 .003, .004
The next set were with the Lee die, then the second number is the same case with a bullet seated and the reading taken on the bullet.
#1 .001, .001
#2 .001, .002
#3 .001, .002
#4 .001, .002
#5 .001, .003
#6 .001, .001
#7 .001, 0
#8 .001, .002
#9 .001, .004
#10 .001, .002
The next cases were from my AR-15 and Hornady 556 brass. The dies are regular RCBS dies. The first number is the fired case, then FL sized, then with a bullet. Rather than type it repeatedly, add a .00 in front of the listed number.
#1 3,2,3
#2 4,3,.0035
#3 3,2,.0035
#4 3,.0015, .0035
#5 .0025, 2, 6
#6 4,2,.0055
#7 5,2,4
#8 3,1,3
#9 2,.0015, 2
#10 3, .0015, 2
#11 5,2,3
#12 5,2,3
#13 5,1,5
#14 .0015, 2,4
Lastly, I did my Tikka 7-08 with its Rem brass.
First number is the fired case, then the same case FL, then the loaded round on the bullet.
#1 1,2,4
#2 2,2,5
#3 2,2, 5
#4 2,2, 4
#5 1,2,4
Next with a Lee collet die.
1,2,3
0,2,4
1,1,1
1,1,3
1,2,2
I’m typed out, but that was interesting to me. The gauge seems to be very repeatable, especially with using both index fingers, one to apply even pressure and one to roll the case.
