Khanh,
There are several kinds of lines/groups. In the UK syndicates are common, which is a group of people who manage/own the shooting rights in a property and share the expenses. There are variations. If the estate is too big or they want to shave some costs, the syndicate will sell a few days each season. Depending on how much they want to spend , they will hire a keeper and a few under keepers, plus beaters and pickers up for the shooting days, or it could be a much more DIY thing with members helping in what they can, and friends and family beating and picking up.
There are syndicates who simply buy days every season, avoiding all the work and risks involved in keeping a shoot. They could negotiate several days for the season with a determined number of birds, and then share the expenses among them.
There are also the pure commercial places, who sell to whoever wants to buy. This could be the syndicates mentioned above, a corporate group ( not very popular right now!) or some agencies who can organise driven shooting for foreigners etc etc...
There are the roving syndicates who sell single days for different people.
Guns: it's not such a big issue as one could thing of.
Pairs are not the norm, these are for the big days where big numbers are expected.
Most break action guns in 12 or in 20 will do for a normal driven shoot.
It's my personal opinion that a sporting gun is perfect, with the extra weight being a bonus for that kind of shooting.
hm
