Beautiful rifle. I really like small bore sporting martinis and have several, but none in such a useful chambering as 360EX.

I’ve hunted whitetail deer with a little double rifle on 360 2 1/4” built for black powder loads. I used NfB loads based on the 38-55 and had a clean one shot harvest of a large buck last year. Bullet was a 193gr 0.366” bullet made by RWS in the past. I don’t know if they still make these but Lapua makes a 185 0.366” or 0.365” flat based spritzer that is very accurate in that rifle.

Brass is currently made by Bertram or you can cut down 9.3x72r brass ( not 9.3x74!). Dies are made by CH4D here in the U.S.

My understanding is the 360 express with a 2.25” case is the earliest, or one of the earliest center fire sporting cartridges and was loaded with everything from round balls up to the 300gr nitro load used by your friends rifle.

Hope you get it shooting and have a chance to report back.