Originally Posted by Tex3030
I trimmed some brass the other day and measured each case after trimming. I found that the trimmed brass was off by +.003 to -.005. The -.005 case came out in the middle of the batch (other than that one case it was +-.003) The lengths were not restricted to long at the beginning and short at the end, it varied on each case.
I am using a Lyman manual trimmer. All of the primers were removed for the trimming and for the measurements. I am using remington brass.
Does case length usually vary this much?
Does the length of the case matter if there is no crimp on the bullets?
I had similar results and found I was not applying the same amount of pressure
each time and this flexed the base of the trimer,so I took the handle off and
chucked a cordless screwdriver to the shaft and solved the base flexing issue.
because your pushing inline with the cutter.(Plus it is faster).
And yes trim length does matter so try not to trim any more than you have to
to be consistant (I like .010 less than the chamber length).
J E CUSTOM