That looks maximized. Don't think you could get much more powder in front of a '06 case head. How' the fireball at night? I suspect it would be spectacular.

What are you using for powder? I recently picked up a 25-06 encore barrel that is my next project. I have rifle with H4381 and H4350 but I'm wondering if there are better options for the short barrel.

I shoot a lot of the Barnes bullets and have been quite happy with their perforce with the exception that i've never been able to recover one from an animal. Have you looked at the 127gn LRX bullet? Not sure of your hunting needs, but they are intended to have improved low velocity terminal performance (maybe a small boost in BC). IMHO a nice feature for a pistol configuration if you need longer ranges and want to ensure good expansion and terminal performance.