If you get 2000fps with a 300gr bullet you are reproducing the British Express loads that were 45 caliber 300gr bullets at 2000fps. Most people buy a 45/70 for power not velocity. I would be more interested in a 350gr bullet and 1800fps or some 400gr lead bullets at 1600fps. Nothing that walks this country is safe from one of those loads. Cast your own bullets and you can shoot it for less than half the cost.
No matter if you get 2200fps from a 300gr bullet it won't even shoot as flat as a 30-30 round with the poor BC of that blunt nosed bullet.
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