These are not necessary, they don't offer new gameplay experiences or some kind of unique mechanics.
That said, I'd happily pay 9$ US to have such beautiful weapons available in game and I'm sure more than a few people would feel the same.
Class 2-6, break action
This is a Sabatti SKL-20, Also known as a Kipplauf rifle. Its designed and purpose built to be a light weight and extraordinarily accurate using small bore cartridges like 6x47 Lapua or 6.5x57mmR.
Class 3-7, bolt action.
A Mauser rifle with a 5 round magazine using the extremely versatile 7x57mm cartridge. Popular for hunting anywhere its available and known in Britain and Scotland as the .275 Rigby, its an extremely effective deer rifle.
Class 4-9, bolt action
A truly classic design, the Rigby Highland Stalker chambered in 9.3x62mm has proven itself one of the best combinations available.
The 9.3x62mm is well over a hundred years old and has proven effective in every hunting ground on earth. Surprisingly this rifle performs better than some modern cartridges like 7mm magnum in terms of penetration but is not so destructive as to make it a poor choice for deer.