Two seasons ago I killed a spike bull elk with my .356win M94. It was wearing a Leupold 1-4, and I definitely would not have had a shot if I did not have a scope mounted, it was too dark to see a front sight at first legal light.
A couple years before, I killed a moose with the same rifle, at exactly 250 steps away. Hit it 2x out of three shots, both in the lungs. Would not have tried that shot without a scope. I used that rifle for years with a receiver sight, and I much prefer how it handled without a scope, but success beats convenience for me most times. The scope has stayed on.