Awhile back, while at the L.E. range walking all over the stuff others left laying on the asphalt, I noticed Blazer .45 "brass" (Aluminum) in abundance. While sorting out some usable stuff (after sweeping it all up) I noticed some SP and LP mixed together. I never knew they made it both.
I found that rather strange, and until now didn't give it a second thought. They for whatever reason decided to switch.
(Oh God, I can see it now. Tomorrow there will be lines at Sportsmans Whorehouse with every body hoarding Large Pistol Primers, with everyone whispering to each other "did ya' hear, they ain't gonna' make large pistol primers anymore!"