So, my thinking on starting this thread was to find out if I could shoot cat sneezes... the lightest load, good for back yards. Clearly, I need a small caliber rifle for that, else the round ball is too heavy.
What ya'll are shooting are what I call Trapper loads. Trappers used to carry a 16" 30-30 with full power loads, using 150 grain bullets, just in case... but they also had cartridges with 85 grain bullets for small game. The light load had the same muzzle velocity as the heavy load, so for short range work, the sights would work for both.
I'll have a chance to give some 50 caliber light loads a try on Monday, using my lefty Lyman Deerstalker.