Acer-m14
20×102mm Vulcan
here is 2 vids on how to save that powder and bullet ..
I have had to pull bullets before. Not that fun when you need to do a hundred or more.
I have never pulled bullets for mistakes. I had a bad lot of LC (5.56 LC97) brass that would fail at the web. I pulled 700 bullets and tossed the brass.If I had to pull a bunch I would get a collet puller if I wanted to save the bullet. Otherwise the above video would suffice. Just being careful not the futz up the threads of your press.
But I have never had to pull more than a couple of bullets. Because when I am running I check charge weight and OAL at regular intervals. First I do every 1, then every 5, then every 10, then every 25 or so. Only increasing the interval when I feel good about the consistency.