I have a 6.5x284. It is light. McM stock, Jewel trigger, Bartlein #3 SS bbl 24" long. It has a Stiller Predator action.
Another option is a 270 Weatherby Mag necked down to 6.5mm. Call McWhorter Custom Rifles
as one of the guys there has a lot of experience with this one and it is also undeniably an elk round as well.
Will someone tell me what a 6.5 Sherman is?
With all the praise of the 6.5x284, I will likely keep to that chambering in the 6.5 diameter. Plus, I really enjoyed the article about it here: 6.5-284 Cartridge Guide
Plus, the good thing about this caliber is the Lapua brass and Norma brass. Can't go wrong.
JB at Accuflite has chosen this caliber as his favorite and hunts elk frequently with the 150 grain Mega bullet. JB specializes in Sako rifles.