I have been reading this thread with interest. One point that several seem to have missed s that the original quest was for a cartridge for a double rifle.That will exclude the use of multiple weight bullets if what I have read in the past is correct and the rifle has to be regulated at the time of manufacture for the particular bullet and velocity. Given the dual game to be hunted, whitetail deer and hogs, my choice in a double would be the .30-40 in the original loading of 220 gr. bullets. It will give adequate energy and penetration, and still shoot flat enough to be useful to 200 yds or so for deer. I have several .45-70 guns, and have killed deer with that caliber and 350 gr hollow points, but I would want a heavier bullet for hogs, which would reduce the useful range. I have done all my big game hunting in the deep south, and am a firm believer in using a cartridge that will provide complete penetration and a good blood trail that is easy to follow in the thickets and cane breaks, especially with something as mean as a hog.
