The Roberts when loaded to modern pressures has no shade really. (+P is good from factory producers) But saami specs on standard ammo leave it anemic. The "creedmore" version would be submitted as a higher pressure spec right from the start.
By the way, Duane Spooner (sp?) of Duane's Gun repair came up with his pet the .257 DGR years ago by necking down the .260R and has reloading data and experience that should make load development for the "25 creedmore" a little easier. Some other options would be the .25 Souper, Dasher, and a couple others. The faster twist barrel should make it a fun project.
