If youre referring to primers for the Alcan brass shot shells, I think they use G57 primers. They "look" like 209's but have a slightly smaller diameter. The 460SW brass uses Large Rifle primers. The Alcan brass shells are 2 1/2" as are the Magtec shells (which use pistol primers). The 460 cases are 1.8"

I just ordered a set of rifled inserts in 45LC with a 2 1/2" chamber, (so I can use 45LC, 460 brass, and 410 shells). I wont load to 460 pressures but Ill use the brass for a "455 BPE". I just made that up. (Im open to other suggestions?)...