Wildcat options for 8x57 IS brass?

[Mojave]

I ended up with 1000 rounds of RWS 8x57. I was going to do a 224-6mm Ackley improved (224 TTHA) or a 6mm Ackley improved.

Tried to make 5,6x57 for my Mauser 66 and even with neck turning they aren't really working.