|
While making up some brass today, I noticed that when forming up to the 308 neck that there is a lot of runout on the case. In other words, when expanding the neck, it deforms the main body of the case some what. While the 125 grn ballistic tips seem to shoot well under sub MOA, I think that the longer subsonic bullets suffer from not getting a good start in the chamber. I would suggest to shoot some full power loads before making up subsonics with new brass. I first noticed this when trimming them
to length, before tightening the collet down on the rim, I would let the case spin while
putting pressure on the cutter end. I was amazed that there was that much deformation. I did not run an indicator on the case but it was easy to see with the naked eye. I am going to load up some subsonics with once fired (super-sonic) brass and see how much of an improvement there is.
ETA: This was going up from 221 fireball cases
Last edited by sniperx; 04-09-2007 at 11:01 AM.
|
Threaded Mode