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as to what calibre it exits..two things bigger hole in barrel =more noise to escape/harder to make it quiet and secondly if your already getting complete penertration with 150grns..any more weight is...

think .22lr cause trajectory is similar..... and for what its worth,using subsonic in 22lr I no longer bother with suppressor,its quiet enough for me.
said this before will probably end up saying...

well you best be aiming correctly then...5 from any mob is good going lol

you will move the front barrel band right back against stock.......like so many have been made over the years anyway,so no issue I can see. its a 44mag so the extra rounds not needed anyway ...IF YOU...

you will love it..mate has begera .44magnum suppressed.... loads of fun. my suggestion is just take it/send it to DPT and tell them to do it,leaving it full length.....they know what works n doesnt....