if you are use to doing it, why skip it? skipping isn't going to hurt nothing...
I should add an addendum that I NEVER trim the length of brass, new or range pick up, until the rifle tells me it needs trimmed...
Lapua put out a bunch of 223 rem brass recently. A LGS had 10 boxes of it a couple weeks ago and I bought some for $80.00. Since I turned mine into 6x45 brass, I ran it through the sizing die, checked for proper length and examined all case mouths. Everything looked great. Had I used it for 223 rem brass, I would have been good to go without any prep at all. Good stuff as per usual, but still needs to be checked just to verify. Also, my box contained 101 pcs. Couldn't be happier with the quality.
