Welcome to the forum. We have an area for "Introductions". Stop in there and introduce yourself.
The suggestion of a AR-15 has, as you stated, low power.
What is recommended for high power as stated in the title of this?
This kind of thread seems to be the works of a troll.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC