Bullet seating

[ArtinNC]

Ok I started my own post after robbing another post .
First picture is once fired and it shows .011 and the second picture unfired shows .003 , why would that be ? all loaded the same way nothing changed . With this my gauge the bullet is touching the rifling so the brass is not seated all the way in the gauge . My stub gauge is made from my reamer and a piece of my 6mm barrel . Why would there be .008 difference in fired and un-fired ? The un-fired first three shoot a .183 group , So I loaded all 10 and the first three that had one firing are .008 longer than the other seven and I though I was loading them all the same . Hope this makes sense .

 

[foxguy]

Did you check the shoulder Bump measurement of the once fired vs the virgin Brass?
The shoulder on the once fired is going to be different.
Did you Verify that the lands in your rifle barrel are exactly the same as the Stub that you had made with your reamer (the same reamer, but possibly, the contact of the lands may be different between the 2).

 

[ArtinNC]

The bullet is touching the lands and the shoulder is not touching the shoulder in my stub gauge because I have the bullets long for fire forming the brass . The base of the brass to the ogive of the bullet should be the same even if the shoulders are different . My Wilson seater was not changed . If the shoulder was touching my Stub gauge there would be a difference , but both the once fired and the un-fired brass are not touching the shoulder .

 

[ArtinNC]

Think I just seen the light !! When I just checked with the comparator set and they are the same so one shoulder is touching in the stub gauge .
Just had a brain fart !!

 

[Bill Norris]

Think I just seen the light !! When I just checked with the comparator set and they are the same so one shoulder is touching in the stub gauge .
Just had a brain fart !!

I was thinking you might find the issue soon.