[dovehunter]

All the Remington shotshell casings that I have encountered in recent years have the monolithic plastic body and base wad. I have not noticed any difference in the interior volume or appearance on any of them. They don't appear to be any different on the inside than STS hulls that I have used so I load them all the same. I have shot hundreds of them using the same loads prescribed for the STS hulls and have never had any problem. I would not, however, do this with any hulls having a fiber base wad but, as I said, I haven't seen any of these in years. If memory serves me, I believe the Lyman shotshell manual has a section on shotshell hull identification.

Regarding the drams vs. grains relationship, there is no direct relationship. Don't worry about it. The dram equivalent is of no use to reloaders anyway. Some of the shotshell reloading manuals I have seen will show this along with the actual loading data but it is only offered as a ballpark guide to the velocities one might expect to get using a comparable blackpowder load.