Thanks.

Looking at Sierra for example, a 158grn .357 pistol bullet has a BC of around 1.6, whereas a .35 rifle bullet might be 200grn .358 diameter with a BC around 2.5 at a similar muzzle velocity. I also found a Spitzer Boat Tail 225grn bullet with BC of about 3.9, but I'm not sure how long it is, and whether I can fit it in with enough powder. And the bullet stability depends a lot on the bullet length, there are so many factors to take into account.

And then again, maximum range is fairly meaningless without accuracy. But drop and windage can be adjusted for, right?