There are various reasons hunters and shooters use optics on their guns. Many like myself don't have perfect far vision. We owe it to the game to make as good of a shot as we can, and for me, that means optics.
I also shoot a lot farther than 100 yards though. I shoot my .45 cal Knight (deer/pronghorn) and my .50 cal Omega (elk) out to 300 yards. I can break clay pigeons at 300 yards with them.
If I stopped when I found accuracy, I would be using 25 gr of 2f with a patched round ball. I look for a high performance load in my current guns. Both are using 120 gr of powder and shoot very close to MOA at 300 yards.
If you like sidelocks, that's cool. This is the long range hunting
web site. I carry long range into front loaders too