Logger..i don't believe they are being brought into Canada....they use heavy flat hard cast bullets at velocities well above the usual factory ammo. Ammo like this is very easy to reload, bullets similar are avail. from M.T. Chambers' Supply. There is a publication avail. called "Supreme Handloads for the 45/70" which shows/uses loads similar to the Garrett or beyond, the Author prefers heavy bullets at top speeds and pressure to 40K, which is the same pressure(approx.) of the .450 Marlin. It's a great read although all these loads are hard on the shoulder.