I do not like belts, thus steered clear of the Lott, and settled on a Rigby. I have never looked back, it penetrates unbelievable, though I normally use heavier than standard bullets nowadays. (550 gr Woodleigh solids and 550gr Rhino "softs" @ 2300 ft/ sec, or 500gr FN solids at 2400)
Here is an article I wrote a while back on the Rigby:
http://www.huntingsafaris.net/pdf/reloadingtherigby450rimless.pdf

Here is a photo of the rifle (the one on top):