Capper,
not trying to start an argument, but I disagree with you on this. Per the Lyman handbook, a .495 ball, started at 2300 fps at the muzzle, only has 697 ft/lbs left at 100 yds. To accomplish this, per Lyman ballistic tables, you need a 43" barrell (as shorter ones wont do it, and you need the ball pushed by 140grs of fff powder or more. Lyman stopped the testing at a maximum of 170 grs of fff, which according to their load tables, only develops 739 ft/lbs at 100.
I cant explain the discrepancy, but I know I am not willing to load my guns that heavy, and my 70 gr load of goex fff takes deer just as well as any modern rifle I've used, and better than some.
Personally, I believe that the ft/lbs figures are just a way to compare power levels of certain loads, but are heavily skewed in favor of high velocity, which these guns just dont deliver. Going purely by the ft/lbs measurements, my bow only gives me about 170 ft/lbs, but the last deer I took with it was a complete pass through also, and didnt go far either. Those measurements dont provide a true picture of what happens to game, and we all know the old technology worked back in the old days just as well as it does today, and we as a species have not starved yet. Those tables definitely sell guns though. I know they sold me a couple before I woke up and realized thats what it was being used for.
Placement is much more important than velocity. I believe it was in the late 1800s that the US Army determined that you need 300 fps to perforate a human being--which is very close is size to most deer. I am not advocating loading down to those levels, just saying that we tend to use more than we absolutely need to--as we should out of respect for the game we pursue. But we also don't have a need to turn our MLs into cannons either. It'd accuracy that means the most, everything else is negotiable.