captdavid,
That has not been my experience with all 170-grain bullets for the .30-30, including the Core-Lokt and Nosler Partition. But if you really want to use a bullet that will expand without "exploding" in the .30-06, use the 200- or 220-grain Nosler Partition at 2400-2500 fps, which I hinted at earlier in my post. It doesn't really matter if one's a spitzer and one's a round-nose, they will both work.
