Rolland,
yes you certainly have a lovely old cadet there!
If its the original 310 Cadet it will be a heeled projectile that you will require.
These can be finicky to get goin, but once you find that correct load it should be a rather good shooter.
Give DoubleD a PM - he's the Martini Guru, there is however some very good data on the web.

Here is a link to CBE here in Oz, Dave has these & there is lot more than just moulds (& very good ones at that) that he sells!
https://www.castbulletengineering.com.au/products/rifle-moulds/310-cadet

Midway sells brass
https://www.midwayusa.com/product/1021450121
Hope this helps
Would love to see you range report when you get the chance!