If your loading the same weight bullet there is little reason to worry since the ammout of bullet base that goes into the brass does not change that much with the lighter bullets.
The larger bullets that take up 50% of the case may be something different but I have yet to load any of these
except the 148 HBwc in my 38 spl.
Here is a picture of a sierra JHC, and two old style,Win SJHP and a Rem SJHP, to show you the difference and why some bullets need different OAL's.