Help with getting bigger Muzzle flash/fireballs when shooting reloads

[Rory McCanuck]

49.0 grains of H-335 under a Hornady 150 gr SP .312 " out of a M-44 Mosin Nagant.
My buddy was quite impressed while I was shooting, so I got him to shoot a couple.
An overcast day, the fireball was easily visible.
About 3' wide and likely 5' long.
Long grass 25' away was blown quite a bit, but no charring

 

[MARKMALL]

For your shotgun try about 33.5 grains of Longshot in a Federal paper hull.
We shot that at nights in pot shoots and get some big fire balls coming out the barrel and porting!