When loading Barnes or other copper bullets I always use the Hornady tool to work up the load. Once I have the correct seating depth for the rifle set on the die I do not keep checking anymore. I have found that seating depth does not change more than a thou or two with them and that change does not seem to affect accuracy noticeably. Got outside of .005 and I have see change though.
Cup and core bullets I set up with the Hornady tool as well, but they are much easier about seating depth.
