Does savage make a .223 specific sized action? Or would you just use a regular short action (.308)?
There's a bolt "buffer" that you can put on a short-action bolt assembly to index stripping .223-size rounds from a magazine. Really, I would term it a "limiter" or "stop", since it mitigates nothing but excessive bolt travel.
The model 10 Scout in 7.62X39 might be your best bet to start with.
QuickLoad seems to have a temperature knob to twist.
I assume the loads were run at the default temperature.
I wonder what the calculated velocities would be if 0 deg F and 130 deg F were used?
Coming from where I am-Victoria, both temperatures should be possible in the span of a day
QL has so much to twist, I probably need a loong time to tweak it in its entirety-All I got to do is wait for the Grendel to get into my sweaty hands...