Aislin Jones and her sister Renae grabbed their most treasured possessions when told to evacuate Lakes Entrance in Victoria a fortnight ago - and those items included their guns.

Aislin and Renae, aged 19 and 16 respectively, are among 36 of Australia's best trap and skeet shooters competing in the Tokyo Olympics selection event that starts in Newcastle on Monday.

Aislin Jones is chasing a second Olympic berth this week while her sister Renae is shooting for a first. Credit:AAP

Four nomination events, two of which are being hosted in Newcastle this week, will determine who makes the cut for the 2020 Games.

Australia's shooting depth is arguably best illustrated by the fact Catherine Skinner - one of the nation's eight gold medallists from Rio 2016 - is far from certain to secure one of two spots in the women's trap.