The more it is a big boiler room necked down to a tiny hole,the closer it gets to being a "destructive device" Things get sudden.I am not really focused on building Mauser sporters right now,but an 8x57 necked up to .338 and Ackley improved might work real well in a standard length mauser box.There are more .338 bullets available.
376 Steyr brass is offered by Hornady,and it's lenghth is appropriate for Mauser Mag boxes.Anything from .416 to .308 would work.
To my way of thinking,the beltless fatter cases are a fine idea,but the standard action lenghth was ignored.The Dakota series,like the ,338 Dakota,make sense to me.
The .220 Swift brass and 6.5 dia might make a nice single shot round.
Look at the PO Ackley "Handbook for Shooters" and I think you will find wildcatters have tried most every combination.Its all fun!!
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