You want noise? Buy a full scale field gun without telling your wife. The noise will go on for YEARS.
from recent posts i'd guess a thunder mug would be best for shear blast and 'the effect ...' or "dizzy factor" as you are in front of the muzzle ......anywhere around it .
i thought about this , for no good reason i think a 1.25-1.5" bore with a bore length 8"s would do !
nice flash too
...
and 911 calls,
car alarms , fire trucks , police cars driving around the block and a plume of smoke that distracts the space shuttle .... oh yea ............neigbors peeping over the fence to check for survivors .
it would remind me of my kids teen age years .(says muttered prayer of thanks they lived)
i have rethought it ...i really dont need a friggin THUNDER MUG right now .....no not at all .