"A mans got to know his limitations"

You are limited by several, including legal, ammunition, firearm, and last, but far, far from least, the 'buff itself, which, would be a challenge with the very best equipment, designed for the task.

If you insist on these solitary walks, you are tempting fate with the parameters you have laid out. You are either very, very brave, or damn foolish, or both.

Until something changes, (like, you learn how to reload shot cartridges for a .458 Winchester bolt gun, and always have a bullet loaded for round two) you may want to rethink this.
Best,
Ted