The directions for the RCBS 2die set says all cases should be trimmed to the same length if your going to use a crimp. If so, I assume I need to trim all, to the length of the shortest case? And, is there a minimum case length? I measured all the case lengths, none are to maximum allowed length. The trim length states 1.910 max is 1.920 some cases are a little below 1.900 in length. This is my first dealings with the 35 Remington all cases are (fired) cases. All input will be greatly appreciated! 
 
		 
P5200-
Howdy !
IMHO -
There are 5 different ways to get into trouble, when loading/re-loading the .35 Remington; and the  first 3  are..... be over-zealous in use of the FL size die...which can result in cartridges that won't fire.  One thing  I  have done with .35 Rem cases destined for use in my
M-336 XLR ... is forego FL sizing, and just do neck sizing.  And for this... a  LEE " collet neck size die excels !  I haven't FL sized any of my rifle brass for 40+ years ( I do not shoot auto-loaders, and am not a particularly high volume shooter ).  I myself have not yet had any cases sized by this method, that failed to feed, chamber, fire; or extract.  Not negatively affecting the case by doing unecessary sizing allows for more predictable adjustments of the LEE collet NS die; as the case shoulder interfaces with the inside matching shoulder of the die collet.
I recommend you run the cases right @ 1.920" case oal spec.  If your clutch of fired.35Rem cases have overall lengths of various measurements, and some/ many are considerably
" short " of  1.920" oal; it is likely asking too much to expect repeat firings to " grow " the cases back to 1.920".  If just .002"  or .003" short, stuff like  that  can be grown in length by just a few continued firings.  Get those to 1.920", and  then  start case oal trimming.
Otherwise....consider sourcing cases that are  not  excessively short from the git go.
I attach value to doing at least a rudimentary outside neck " turning ", even if it is a skim trim that simply removes " orange peel " texture from the case' outside necks.  Remington-brand .35 Remington cases I have received have no more than .012" neck wall thickness, and many even less.
I recommend you use a primer pocket uniformer on all primer pockets after a couple of firings ( for brass that has a flat primer pocket upper surface ). That allows the case head to stabilize in  your  rifle's chamber/bolt head.  I also recommend you do inside flash hole deburring, and gage all flash hole for under or over size diameter; on all cases.
You're in luck, because .35 Remington cases capacity and common bullet weights place potential powder choices squarely in the zone populated with proven benchrest powders.
 * I use my M-336 XLR over-the-bench, for accuracy work and not in the field; so... I don't use a crimp.  If  I  did  crimp... I would try using a .380 ACP taper crimp die; because I run .010" neck wall thickness on my cases.
Note:  2 pics below show a 5-shot 100yd group I shot with my M-336 XLR .35Remington.
I was using a windflag, and first 3 shots grouped closely.  I held outside the group for the 4th and 5th shots...based o n what I  THOUGHT  the flag was showing me.  AAackkk !!
Well..... that's all how  I  do .35 Remington.    But hey.... what do  I  know ?!