You do not "need" to crimp if you do want to make sure to use the lightest crimp possible and only then if you are using the Lee FCD. AS for loads:
With a SAAMI 1:10 I think you will find your best accuracy load to be somewhere between 27.5-28.5 grains with COAL between 2.275-2.295.
With a SAAMI 1:10 I think you will find your best accuracy load to be somewhere between 27.5-28.5 grains with COAL between 2.275-2.295.