45-70 not a long range cartridge? How about 3,200 yds with enough retained velocity to still be lethal.
The US Army found this during The Sandy Hook Tests of 1879.
Large slugs (500 gr in this case) retain velocity quite well once below sonic speed.
These tests were with black powder and lead slugs. The 45-70 of that time was nothing more than a converted muzzle loader, either type firearm with the same load would have similar performance.
link to test info: http://www.researchpress.co.uk/longrange/sandyhook.htm
Sorry, no sell with me, especially balls, I use 325 grain Hornady and I can tell you I don’t buy bs.
Not to mention the Springfield trapdoor used in the Indian wars, by Custer and the boy’s