Thanks Gents, it all makes sense now. My ( 6.5x55 Swed ) deprime&sizing die was a bit sticky even with case lube. In hind sight, it stands to reason that a case that is a little dirty might cause some drag. I was also thinking that tumble would be after deburing (to smooth out any sharp edges on the case mouth.) I'm off marching in the right direction now.
Got to say that reloading tapered/bottle neck rifle cases is MUCHO labor intensive vs the handgun ammo I'm used to messing with. ( Straight walled, carbide dies, no trimming, etc) Now I remember why I just started buying factory ammo for my AR's. I guess it will make me shoot them slower ;-)