Every conceivable gap has been filled to deth....but we like to tinker..a 270-250 savage would be sweet...I always thought the 270-308 would be nice too...before the 6.5 rage came on...there was a genuine gap between the 25s and the 270...but for good reason..the 257 Roberts and 25-06 were wonderful and if you wanted a little bigger the next step was to 270 -or 284..ya see we really didn't need anything in 6.5. Could have just settled for higher bc bullets in .257. But think how many guns and ammo have been sold due to the magic new cartridge ....