Bulldog .357
You will need an adapter to adapt a suppressor on the Bulldog. Here is the link.
https://donnyfl.com/products/benjamin-bulldog-357-m18x1-with-thread-protector-a41?_pos=1&_sid=f71340246&_ss=r

I recommend the Emperor .357 M18x1.
https://donnyfl.com/collections/ldc/products/2-x-10-5-inches-emperor-v3?variant=14050945073195

Here is a video on how to install it from one of our customers.
https://www.youtube.com/watch?v=cZEFREFoCxM



Bulldog .457

You will need to buy the Emperor .45/.50 M18x1 #S5B. This will be a direct fit on the threaded barrel.
https://donnyfl.com/collections/ldc/products/2-x-10-5-inches-emperor-v3?variant=14050945105963