Straight from the Winchester website ballistics table:
45-70 Government
300 gr. SupremeĀ® Partition GoldĀ®
Yards Velocity FPS Energy ft/lbs Long Trajectory (in.)(200 yard zero)
500 910 551 -193.7
As a comparison the Winchester 180 grain accubond 300 win mag:
Yards Velocity FPS Energy ft/lbs Long Trajectory (in.)(200 yard zero)
500 2095 1754 -39
It has certainly been done but I'd be more likely to go with a 300 win mag versus 45-70 at that kind of range.
16 foot drop at 1000 yards and 910 FPS (43% of the 300 win mag velocity at that range) and subsonic for the past 100 yards... not sure I'd count on that. Cannot use standard irons or a scope.. will need a vernier sight for sure.
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