Russel Nash
05-29-2017, 03:12 AM
My original thread is here:
http://castboolits.gunloads.com/showthread.php?331117-I-bought-a-concentricity-gauge-WARNING!-J-word-bullets-ahead&highlight=Concentricity
Long story short, I resized my processed brass with an RCBS X sizer die with the decapping mandrel removed.
That got the runout of the empty necks down to like 1 or 1.5 thousandths.
Then I swapped in my regular .223 toolhead into my 650, and loaded them up like normal.
It did this to 30 or so rounds.
I did run into a little hiccup with little copper flakes getting shaved off while seating the 69gr SMK's.
And there was a little bit of runout still at the bullet.
But they seemed to group fine at 100 yards:
http://i603.photobucket.com/albums/tt112/gryphon1994/20170510_173311_zpsffajmysu.jpg
That is 5 shots. The penny is in there for scale.
I will spring for a Lyman M die and a Redding neck bushing die to see if that straightens the necks AND keeps little pieces of copper from getting shaved off the jackets.
I did try some factory Federal XM855 and XM193 ammo. Turns out they have really bad runout too and can't group with a darn either. So I suspect my brass processor didn't know that the surplus ammo he was buying had the same crazy runout at the neck.
http://castboolits.gunloads.com/showthread.php?331117-I-bought-a-concentricity-gauge-WARNING!-J-word-bullets-ahead&highlight=Concentricity
Long story short, I resized my processed brass with an RCBS X sizer die with the decapping mandrel removed.
That got the runout of the empty necks down to like 1 or 1.5 thousandths.
Then I swapped in my regular .223 toolhead into my 650, and loaded them up like normal.
It did this to 30 or so rounds.
I did run into a little hiccup with little copper flakes getting shaved off while seating the 69gr SMK's.
And there was a little bit of runout still at the bullet.
But they seemed to group fine at 100 yards:
http://i603.photobucket.com/albums/tt112/gryphon1994/20170510_173311_zpsffajmysu.jpg
That is 5 shots. The penny is in there for scale.
I will spring for a Lyman M die and a Redding neck bushing die to see if that straightens the necks AND keeps little pieces of copper from getting shaved off the jackets.
I did try some factory Federal XM855 and XM193 ammo. Turns out they have really bad runout too and can't group with a darn either. So I suspect my brass processor didn't know that the surplus ammo he was buying had the same crazy runout at the neck.