In the Netherlands only long guns are allowed for hunting, no handguns.
Roedeer, our smallest big game animal: rifled barrel with a V100 of at least 980Joule (a .222 would make the cut)
Fallow deer, red deer and wild pigs make up the rest the big game animals in the Netherlands, they require a rifled barrel, a caliber of at least 6,5mm and a v100 of 2200Joule
Mouflons (Ovis Orientalis) were introduced in the 18th century. They are now practically extinct in the wild as wolves recently migrated to the Netherlands. As far as I know they are not hunted anymore, some still live in a fenced off national park (hogeveluwe.nl)
Rifles can be bolt-action or semi-auto but semi-auto has a two round magazine capacity limit.
Lead-free ammo is your choice, encouraged or mandatory depending on where you hunt.
Silencers are only allowed for professional gamewardens, non-professional hunters don't get silencer permits (This might change in the future but discussion is going on for more than ten years now)