Groo here
I believe the 41 mags for Pusser were loaded by J.D. Jones [SSK]
If you can carry reloads or have a Custom Manufacturer [ mine is Kudu
Kustom]
You might look at GT Bullets.
They have #4 41mag boolets [ #3 Are HP]
The most interesting being a 215 gr SWC-HP.
With a 1000 FPS loading , they may be just the ticket.