Nice boar! Hungary is pretty good depending on which part of the country you're going to hunt. I prefer south, along the Croatian border. It's more of a rule than exception that you'll easily get some 10-15 shots off per drive without pushing too hard or shooting everything that runs by. OTOH 3-4 drives a day on a 4-day hunt means that plenty of ammo will be needed.
Monteria-style hunts are fortunately much more laid back in terms of number of shots fired. The ones I frequent in Spain commonly have far more beaters and dogs, 150-200 of each compared to maybe a couple of dozen in Hungary, but game densities aren't comparable and shots are typically much longer.
While I prefer large non-magnum calibers for central European style driven hunts, monterias necessitate some reach so I usually pick the .375H&H for them. Not that .308 wouldn't do the job but as a part of the etiquette wounded game that has to be tracked "costs" additional bottles of nice whiskey/gin/rum/vodka for the tracking crew and at some point they'll start looking at you funny. Unless you insist on doing the tracking yourself; not advisable unless you're VERY familiar with the terrain and prepared to see at least a dog or two gored by a wounded boar. Been there a couple of times, it can get really ugly.
Oh well. This veered a bit off the topic. Sorry about that. Nevertheless, it's usually a good idea to bring enough gun and even exaggerate a bit in that regard.