Everyone has their opinions. Mine is that I like some expansion, and that i would at least temper the nose (providing the bullet has antimony in the content), or make it with a soft nose. I temper by placing 1/2 in water and heating with a torch till it just is about to begin to melt. This makes for a hard shank and a soft nose. I can do this or i actually prefer to make a pure lead nose with a hard water dropped shank. This makes for a Nosler partition effect and get good penetration and expansion. I've used hard cast by it self and got pass throughs with little or no expansion. Can lead to long blood trails.
Winchester and some Marlins have 1 to 12 twists. This works best with cast going up to 2100 or maybe 2200fps. Marlins in general have 1 to 10 twists, which puts a stiff spin on cast and may make them unstable if shot faster than about 1900fps. The above information is correct. If using a soft enough alloy, the speed not be over 1800fps or even lower. They can be just as deadly as your best jacketed bullet. Experimentation may be needed for your situation. I'd at least look into what would best for your general concerns.
This year i have a 1 to 12 twist Marlin (336XLR) that is shooting a 2300fps load. I've got the pure lead nose in a big, long 200 gr. bullet. (RCBS-180-FP). I don't really need this, and it would work for elk, but it will usually drop the deer quicker than any other cast situation if not hitting CNS. Last year i shot my buck with a 7.62x39 using quite a smaller bullet at 175 yards and he only went 20 feet. I love shooting cast, but it does require a bit of homework if you want to be able to know approximately will happen with a good shot.