Like a few people have said already the majority of the rifles seen are 1827f's from either the late 90's or early 00's looking at the way the actions are milled. (older actions have even more meat to them while newer are much leaner) The one identifiable classic bolt rifle is an 1827b which is a biathlon specific version of the 54. (different stock, sights and trigger) Most Cadets don't get to handle the fortners until they go to nationals since provincials are shot with old single shot light target rifles. (Don't know make or model just that most are in need of loving)
As far as ammo goes it really depends on the unit and how much they shoot since the Sea Cadet unit that I am most familiar with was still using old stock Winchester white box as of a few years ago while the Air Cadet unit that I am familiar with goes through thousands of rounds a year. (Can't remember what the Air Cadets shoot. Might be Federal, Elly, SK or CCI)
Hope this clears things up a bit
As far as ammo goes it really depends on the unit and how much they shoot since the Sea Cadet unit that I am most familiar with was still using old stock Winchester white box as of a few years ago while the Air Cadet unit that I am familiar with goes through thousands of rounds a year. (Can't remember what the Air Cadets shoot. Might be Federal, Elly, SK or CCI)
Hope this clears things up a bit