Post by Mark
The MGC .45 Thompson cartridges can be used, I would think due to their size, shape and their length being close to the Hudson originals. Now, that being said, just be sure to look at the plastic chamber area to ensure that it isn't wearing unusually. If the chamber/detonator appears good check the bolt face for any unusual wear too.
There shouldn't be any problems with usuing the MGC cartridges (other than wearing them out for the Thompsons use!)
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Wanted to buy: MGC Sten MK3....trades?(still)
MGC MP40 Marushin MP40 Nakata MP40 TRC MP40
Modelgun manufacturers, past and present:CMC,CAW,Hudson,HWS,LS,MGC(R.I.P. 1960's~2007) Marushin,Marui,Kokusai,Shoei,Tanaka and Western Arms