You're very welcome! Also, look at the shape of handguns prior to the advent of self-contained cartridges. They also tend to have a curve to them for the same reasons. You may also see a tendency in modern large-frame revolvers and some 20th century combat revolvers to sometimes have a straighter grip. The goal there being to make re-acquiring the target for a follow-up shot faster. The former use the mass of the gun and sometimes advanced elastomers to soak up some of the recoil, while the later used the mass of the gun and not giving a fuck about the soldier firing it for that purpose.