I have used bullseye in rifles sparingly on rare times in ctgs up to and including 06, however I do not like to use it by choice, as double charging is ALWAYS possible. Mostly, I have used it for fire forming cases, K'ing hornet brass in particular, but have used it in formed 8MM from 06, and 243 from 308 brass, and way back some 270 & 35 Whelan, from 06 brass because as stated a little goes a long way, and I am cheap. My rules of thumb are as follows when doing same: All cases must be the same mfg, and preferably the same batch number and or weigh within 1 grain of each other. Regardless of how careful I am I know that a double charge is possible, AND I once blew up a good 06 because of that (I believe)!
Accordingly, after I seat the bullet, but before crimping (if I need to crimp) I weigh each loaded ctg. I expect to be within 1 grain +/- on the loaded case. Any variance above that and I pull the blt, to discover my error. Since adopting this procedure (which takes a lot of extra time), I am much more comfortable that I have minimized the danger potential, and maximized the safety potential. Feel that there is also the potential for increased accuracy with this procedure, but that may be just me. I do this with all of the fast shotgun type powder loads in cast rifle loads. Also, that said, I have made it a point with all cast loads of 2400 and slower powders that fill less than half the case to weigh the loaded case. By half of the loaded case, I mean that I fill the case to the mouth, weigh the powder, and divide the charge by 2. I shoot a lot of Ed Harris' loads for initial testing of new bullets, and have yet to find any problem with his recommendations. Being an old codger and retired allows me the time to be able to use my these procedures. It is kind of like the old saying "measure twice cut once"!