60-65 grains with a 535 grain Minie???? Wow, that's a lot of wallop!!!!
The "Pennsylvania Bucktails Regiment" (The "originals" recruited at the begining of the war by Thomas L.Kane NOT the 149th and 150th PA.) were all recruited backwoodsmen from Pennsylvania, made up of farmers, lumberman, miners.
It is said that on regular basis, they were hitting targets farther away with their 1861 Springfields than Berdan's Sharpshooters could with their Sharps rifles. In fact in their regimental history in West Virginia a Bucktail took out a Confederate officer at 1200 yards.
Probably a one in a million shot, but impressive nonetheless!!!!