Any gun or rifle must be securely locked in a safety box. If one can temporarily not meet up to these restrictions one must keep the vital part of the rifle apart from the rest of the rifle. When travelling across someone else's land where one does not have hunting permission, the rifle must be placed so that it cannot be reached during the drive and shells must be taken out of the barrel. There are also regulations on the types of guns that are allowed during hunting. Multiple shell shotguns are for example not allowed.
Some game require certain calibers etc.
Be aware that almost all hunting in Sweden requires the presence of a hunting dog to be legal. Foreigners who wish to hunt in Sweden have the possibility to do so if invited by a Swedish resident with hunting permission. There is an annual fee to be able to go hunting. It must be paid, and brought along and in addition, one must have an insurance. In order to be allowed to bring in weapons into Sweden special permits are provided for by the police.