BPTR Rifle Suggestions

[Rockridge]

While having breakfast with Steve Anderson and his lovely bride the other morning, the conversation turned to Long Range BPTR. On the way home, SWMBO asked, "What is needed for one of those rifles"? Looking back on the answer she received, I realized that I had no idea what the "Ideal" Long Range BPTR configuration actually is.
What Caliber?
Barrel Length?
Twist?
Paper Patch or Greaser?
Scope or Iron Sights?
Bullet Weight/Length?
Bullet Velocity?

After spending many hours on several websites, I think I have an idea of the basics.

What I'm looking for would be the "Best" configuration for Long Range BPTR (800, 900, 1000 yards) at competitions mostly in Wyoming, Colorado, and Phoenix, Arizona.

I realize everyone of us has our favorites, but, what works for you?
And WHY do you think so?

Ed
Rockridge