Mecury reducers have been used
for many years in shotguns,and rifles
without problems.
A reducer would help the balance
of a Merkel big bore IMHO.
I have a reducer in my 375H&H
pre 64 model 70 that equalized
the balance to a between the hands
position.With no problems.
My Krieghoff 375 has one also.With no
problems.
I will add a new stock for my 20 ga.
barrel,then I can balance it as
a shotgun. The reducer with the 20
would be butt heavy. Not what I want in
a shotgun.

Ken
San Antonio