Help design the NZHS Forum Wildcat - Part 1 - Action length

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Alrighty - have come up with the idea to design a wildcat cartridge via the forum here
If it all works out, I'll get a reamer made and see how it goes, others will be able to borrow the reamer also.
It will become the .XXX NZHS or XXX Thingamahugit
Doesnt have to be a million fps with 500gr of powder based on 20mm case - something thats more practical - there are more than enough superboomers around
Something at the end of the day that is easy to form cases for , buy projectiles etc, and is usable for the majority of NZ hunting - sub 200m?

So will do it in stages with max length for action, caliber, speed, case, name etc

My vote is for something on a short action - max 223 length (SA or AR/SKS) or max of 308 length (SA)

What do the rest of you think? give it a few days then move onto next stage once we have a clear winner.
You can choose more than one action size