Yeah. do shoot them. I'll be real surprised if there is any appreciable difference. There are so many additional variables when loading and shooting a MLer that a RB that is, maybe, half to one percent different in weight from another is not going to shoot a whole lot different.
IIRC, the standard weight for a pure lead RB at .535" dia. is 231 grains.
FWIW - I just measured and weighed five RBs, picked at random, that were cast with a similar Lee mold. They were all at .5295 - .5305" dia. and weighed, cast in as pure a lead as I have, 219.9 - 221.4 grains, less than one percent different in those five.
Pete
Pete