Looking for some advice on Saeco #21A 400gr bullet

[Ace Lungger]

Howdy guys, still trying to find what i want, and i like the looks of this bullet!
I was wondering if anyone has used or is useing the Saeco 400gr sp bullet in there 45-70, and if so how do they perform? Are you useing B.P., if so, could you tell me what loading specs that you are using!
I would like to hear from anyone that has or is using this bullet!
Thanks ACE