When I had mine,I loaded it to the original 410 gr velocities of 2370 fps. The few jackrabbits shot with it didn't complain about not enough speed.

Been awhile so I do not remember the powder or charges,but it was a bunch per cartridge.

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Take your responsibilities seriously, never yourself-Ken Howell

Proper bullet placement + sufficient penetration = quick, clean kill. Finn Aagard

Ken