You still need a specific licence to purchase & store black powder, but not for modern nitro powder. Reloading shotgun cartridges not really worth it apart from speciality loads or black powder only guns ( or old muzzle loaders, which is a whole extra entertainment level getting it to work especially in the rain).
Reloading centrefire rifle ammunition can be cheaper (& is probably more accurate), but needs a careful discipline in getting it right & safe.
Reloading centrefire rifle ammunition can be cheaper (& is probably more accurate), but needs a careful discipline in getting it right & safe.