If your shots are going to be close, as normally in a spot and stalk, even the roundball is a deadly projectile. In your hawkins, try 80 grains of 2f powder and a patched roundball. Normally that is pretty accurate.

Maxiball shoot well out of my Hawkins. Maxi Hunters do not. Some other conicals that do good are REAL conicals, and Hornady Great Plains conicals. All of these are good projectiles.