That is an excellent idea. When I was much younger and looking for ways to spend hours at the loading bench, I weight sorted 100 rounds of 22-250 and cut them out into 5 batches. It wasn't a complete waste of time - the results played out just as you would expect - but actual volume would clearly be more accurate. Perhaps you could find a medium less volatile that paint thinner, since fumes might linger and cause higher pressure.