Is there a chance to find the same lot number that is on the Sierra 500 round count box of bullets that I bought a year ago or its more likely I need to start a new load development if lot numbers don't match? Would it be off a grain or so and be able to shoot the same as it used to? I am running low on the 123 Sierra Match. Time to find some more bullets.

The main thing I worry about when switching lot numbers of bullets is the ogive location from lot to lot. Load it to the same ogive, and you should be fine with a new lot #.

I have noticed that, recently I checked bullet measurement from base to ogive on two different lot numbers, and it was off by .035