Ruger did a No1 in 458Lott. I would rather have the classic 450. But as for most powerful, that would be the Lott.
Hornady was doing brass and ammo. It was available at cabelas of all places. I think that is no longer listed there.
I too though it was 3", but google confirms 3 1/4. That is the Hornady version as well. I think Boddington and Hornady were together on this revival.
Factory loads, yes the Lott is more powerful. But the 3 1/4" case is .45" longer than the Lott, so loaded to equal pressure, it should be more powerful.
