Full length sizing with small base dies base dies is a good idea, and make sure each reloaded round functions through the action before taking it afield (as you know this must be done in a safe area); or, better yet, stick to factory ammo.
I once sent my BAR 7mag back to the factory because my FL resized reloads wouldn't completely chamber. The problem of course was that my damned die wasn't sizing them down enough for that particular chamber, but I was new to the game at the time and thought all sizing dies were perfect. The autos don't have the camming power of a bolt gun, so the case must chamber without any effort.