I have a pre-64 M88 in 358 and it's a wonderful rifle to hunt with. The triggers need work and the barrel is so thin it sizzles after a few shots. How many shots do you need to put downrange to put meat in the freezer The gift of the M88 is how well it points. It comes up to your shoulder like a wing shooter's shotgun and it's just right there, pointing where you want it.
For hunting its 200gr. Nosler AB or 200 gr. Hornady SP pushed by 47 gr. 3031 does 2550 fps.
For CB loads I use a 245 Saeco pushed by 40 gr. of IMR 7383