The Win LP are marked standard/magnum, but the small pistol are not.
Henry, if you're not working with max loads (I'm guessing not with Unique and Titegroup) in most cases you can substitute magnum pistol primers without any pressure problems. Velocity may jump up a little; the chronograph will tell you for sure what the change is with each load.
One potential issue to keep in mind is that pistols with light hammer/striker springs may have more difficulty igniting magnum primers. This can present as either failures to fire, or large ES in velocity.
