My apologies. I stand corrected. There is quite a difference between the Second (1970's) and Seventh (2010's) editions of the Hornady Handbook review of the Carcano.
I was given one ( a long but funny story ) in 1974. Fired a few rounds with factory ammo and got terrible keyholing and horrible groups. I read the Hornady Handbook review:
"The post WWII importations of surplus Italian Model 91 rifles chambered for the 6.5mm Carcano cartridge (or 6.5mm x 52mm Mannlicher Carcano),and their subsequent sale to American shooters at justifiably low prices has given wide distribution to this firearm.
In retrospect, the prices may not have been low enough. The action of the 6.5mm Carcano is sloppy and lacks the extra margin of safety of the best military actions; the finish of the rifle is crude. Scope mounting is difficult and the essentially not worth the effort."
After reading this, I set the rifle aside. I haven't fired it since.
The newlnHornady Handbook tells a very different story. Apparently this cartridge requires a .267" diameter bullet rather than the standard .264" 6.5mm bullets (Hornady sells 160gr roundnose)
N
The ammo I tried could very well be the reason mine performed so poorly.
Anyway, I wish you the best of luck with yours