As far as load data goes I would recommend IMR 4350 to keep the pressure down and load density up. you might have to go with Carcano bullets (.268") if your bore is worn badly. Some guns will not shoot .264" bullets. I have shot a lot of 4350 in my 6.5 Dutch rifles and it works great. Start with about 32gs and work up to the max in your gun.

I like the 160gr Hornady RN for the Dutch round.

Keep us posted.

Corbin