There have been a couple that were memorable, a 7.25# all up Jarrett 358 STA that broke scopes and pegged out my fun meter pretty quick, a custom 458 Lott that was a bad idea at 9.5 # (my previous 458 Lott was an A-Square that I thought was too heavy) and I took a pretty good ass whipping sighting in a friend's unbraked 416 Weatherby.
I've not shot many doubles, nothing was over 470 NE but I didn't find them unreasonable, nice weight and balance (fired offhand or a standing rest).
A new Sharps shooting 50-140 smokeless loads was pretty grim.
