Shoot them slow at close targets. No recoil, and no new hole means a squib. Take a cleaning rod with you, They come out without that much of a problem most of the time.
Weighing them is a futile effort. The variance of weight in cases even of the same head stamp can be greater than the powder charge.
If all else seems too much a press mounted bullet puller might be in order. Though that is still a lot of bullets to pull, and a lot of time involved in doing so.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.