Holley-Tell your friend that it will totally pass thru with the
100 grains no problem at all.Years ago when I first started
blackpowder hunting I also had the same concerns.I had the
T/C Renegade for my first rifle then.My load was 90 grains of
pyrodex with a T/C maxi hunter bullet.My deer came along that
morning which was a nice four point buck which I shot behind
the front leg taking out both lungs and breaking the shoulder on
the far side when it exited the deer.Deer probably went 20 yards
before falling.What really impressed me was the bullet not only
passed thru the deer but also so thru a 4 inch sampling tree behind
it and I dug the bullet out of the ground and I knew then that 90
grains was more than enough for a pass thru and made a believer
to me that it was more than enough horsepower so tell your friend
not to be concerned about it.I now shoot a Barnes Expander with
90 grains with the same results and that load is awesome also.So
you gave your friend some good advice! Mike