Angel, I load on MECs so I can't help you with any questions on the PW but I load a lot of of 2 1/2" 16s using the Gualandi SG-16 and the DR-16 wads.
Here's my experience. The SG-16 works best in a 2 1/2" fold crimp hull, without any filler needed. The DR-16 works better in a 2 1/2" hull for roll crimping, without any filler. The DR wad is too tall for a fold crimp load. Both of these are 7/8 oz loads, which is all I load.
If you want to roll crimp an originally fold crimped hull the Precision Reloading roll crimp tool works best. I also have roll crimp tools by Lyman & GAEP and these work better on hulls not originally fold crimped. These give a more rounded final crimp where the Precision tool give a more squared final crimp, but nothing wrong with the end result. I do all my roll crimping on a large drill press with a hull vise.
Here's another twist. I struggle with getting good looking crimps on RST hulls. Once I have them final fold crimped I run the loads thru my GAEP roll crimp tool which greatly improves the looks. Probably doesn't improve the loads but does improve the looks. Photo below shows the before roll cimp-bottom, after roll crimp-top. Mike
