As a corollary, we now have good information as to the Smokeless Powder pressures for which our turn-of-the-century doubles were designed; just use shells with similar ballistics.
https://docs.google.com/document/d/1F2sQuPm05IE4VWYYnCkvuXmYEzQoWd_SQgaAfUOZEFU/preview

Many of us choose to use lighter loads, because of our hopeless flinch, our guns are old like us, and because they are funner smile