Need some help… I’ve decided to get into reloading, so I bought a few things yesterday including a dial caliper and a Sierra reloading manual. I’ve been wanting to start reloading for a few years now, and I’m finally taking the plunge. So anyway, I’m reviewing some of the data in the manual at the same time I’m measuring some of my ammo here at home, but the numbers don’t match?! My problem is that I’m concerned that my caliper isn’t accurate, but I don’t really have a way to verify without getting a second caliper. Here are a few examples: When I measure the bottom (rim?) of the .45 ACP case, I come up with .476”, but the book says it should be .480”. The same holds true when I measure the rim of a .357 magnum case, I measure .434”, but the book says .440” Now, if the readings were always consistent (say .005 off), I could conclude that my caliper has issues, but sometimes the reading is spot on. For example, when I measure the bullet for a 7.62x39 cartridge, I get a value of .311, which is exactly what I would expect. So what do you folks think? Is this normal, or do I need to replace this caliper? If it’s normal, do the values in the book represent the max allowable? Thanks in advance for any help.