RE: Light arrow penetration
When I go lighter for that flat trajectory and making it easy to hit those 40-75 yard shots, I drop all the way down to 177 grains - patched .490 round ball in front of 80 grains of Pyrodex RS in my Kentucky rifle for about 1600 fps and some 1000 ft lbs.
To me, ifthe critter ispast 30 yards, it ain't bowhunting.