I have a Carbine which was the original "eargesplitten loudenboomer".... all the way to the point at which I parked it on a rack for 20-odd years.
Then the BRAIN started to work. Rare, I know, but it does do things such as that on occasion.
The Carcano military ammunition was loaded with 30.09 grains of a type of Nobel Balistite. This was a double-base flake powder formed from thin sheets of nitrocellulose which had a coating of nitroglycerine rolled into its surface by steam-heated rollers. It then was allowed to cool and then chopped into flakes, tumbled with a bit of graphite to prevent clumping.... and loaded into the military rounds. This all is detailed in the TEXT BOOK OF SMALL ARMS - 1909 (HM Stationery Office, London, 1909). It was a very energetic and very fast powder..... and it worked just FINE.
So I loaded up some ammo with the only bullets I had (Remington FLAT-base 140s) and about 30 grains of IMR-4198 (a load NOT mentioned in the books) and tried it out. Little rifle performed beautifully, bullets on target, no 2-foot fireball at the muzzle, no ear-splitting crash. So I tried a few in a nice, new Model 41, which has a 27-inch barrel...... and got sub-MOA groups. No problems at all. Brass comes out almost as nice as it went in, no pocket expansion, easy to resize.
A couple of the guys on this forum now are using the same load..... and they are getting excellent accuracy. I'll let them speak for themselves.