The flash hole is GTG all the time, it doesn't change dimensionally after several loadings.
What does change is the primer pocket. Over time after several firings, and especially if you load near max, the pocket will increase in size and primers will seat too easily. I don't know how to advise you other than to segregate your brass and keep tabs on how many loads through a case. Also, you'll find that some brands of brass are tougher in the casehead area and can take more reloads (Lake City) than others which have softer pockets and are good for maybe just a single reload (cheapo Federal). Since you live overseas, I have no idea what you have access to.
When you start seating primers and you feel minimial resistance, it's time to be wary. Don't tempt fate and try to string another reload out of them, just dump that lot of brass. I realize that may be a vague description, i.e., "minimal resistance", but over time you'll develop a feel for what constitutes "too little". You'll just have to learn along the way.
One other thing I never mentioned earlier and you never asked about, you'll probably come across brass that has crimped primer pockets. For excample, you'll shoot some commercial XM-193 (LC, Privi) and then you'll want to reload them. Before you reload these, you'll need to remove the crimp (otherwise you'll crush new primers when you try to seat them). This is a one-time operation. LC brass is a good example, their pockets are crimped and you can tell this by the depressed ring right around the pocket's perimiter. You have two options of removing this crimp:
(a) reaming it out. This involves cutting it out. Hornady makes a economically priced tool that you can use either by hand or chuck it in a drill/cordless screwdriver. If you use it by hand, get the knurled reamer handle along with the reamer.
(b) swaging it out. This involves displacing metal, or simply moving it out of the way. The best tool for this seems to be Dillon's primer pocket swager. It's pricey, but everyone that has one talks highly of them. The cheaper alternative is RCBS's swager that is press mounted, but end user reports are less flattering. It's a bit more tempermental and supposedly is sensitive to primer pocket depth -- mis-adjust it and you bend the rod and have to order another.
My advice since you are overseas, if you can spring $90 for the Dillon unit, get that. Otherwise pick up a couple of the Hornady reamers at $5-6 per reamer, and get a handle if you elect to use this by hand.
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