Rookhawk, I have no intention of using my 6.5 x 55 on anything above deer sized animals. Th Lapua data you showed is slightly over 100 FPS faster than my deer load. Providing it shoots well and is achievable out of a 24" or better yet a 22" barred I may be interested in trying it out. So far I haven't been able to get the "grandkid's" gun to shoot a 120 gr bullet accurately. To be fair the first load I tried was reduced to right at 2500 FPS. It may need to be faster to group well. That same rifle shot 156 Gr. Norma Oryx just fine.
The problem with these storied euro metric cartridges is that the long throats and twist rates were built for heavy for caliber bullets. Solution if going with lighter weights is to maintain heavy for caliber VOLUME of the bullet. Translation: use copper bullets if you need to go lighter and they’ll perform like the 140-160gr lead they were meant for.