i used a .45 Basic case from Norma.
my thoughts when designing this were that if i built my double nrifle
why not a new cartridge

i will be using either norma or vihtavouri powder.
i´m looking to send the 270 gr bullet att about 660 - 710 msec
so nothing outrageus.

and as for the reason to build it.... why not

the double rifle is built on a brno 16ga sidelock action

/Roger