To answer the question you may have really been asking, a 1.5% weight variance is a pretty good chunk but not horrible; however, if it's +/- 1.5% (ie, 3% or 6 grains top to bottom total in a 200gr SWC) then I'd consider looking for a different supplier. Of course, I had a buddy who was mass producing lead bullets in his garage and selling them to me for basically the price of raw lead and tax free. They were also 200gr LSWC's, and your numbers sound kinda familiar! To put it politely, his bullets left a lot to be desired, but I was getting them so cheap I couldn't walk away from the deal. Basically I visually culled out the worst, weighed enough good ones to set aside for match days, and just shot the rest in practice sessions. It worked out okay because I wasn't exactly tearing up the scene so I didn't have much to lose with the crap groups, however nowadays I miss his prices but not his bullets!
I took a better look at the weights with a larger sample and the "problem" seems to be batching i.e. most seem to be in the 202.5g to 203.0g range and a few are 199.7g - 200.5g and one was 196g ( maybe a bubble?) so the spread seems to be about 3g or 1.5% total.
These come from Straight Shooters cast Bullets in West Virginia, not super cheap at $115 for 1K (inc shipping) but I can place the order on Sunday and they are on my doorstep Wednesday! Most other well known cast bullet manufacturers can't even be bothered to answer emails or the phone these days! I have had an order in with Penn Bullets for 6 weeks now no response to any comunications so I can't even cancel the order! Shortages do tend to make companies throw customer service by the wayside!
I will load up a bunch sorted and unsorted and see what happens!
Thanks
Jon