Here's my load for my pair of Walker 44/44s: over ball grease du jour, .454 soft lead ball, felt lube wad, 44grs or FFg Goex, #10 Remington cap.
I came to this load "the hard way". I figured to make a big blast at a CAS match and was shooting 50grs FFFg with the above other components. By the end of the 6 stage match I was getting all kinds of big blast & smoke and just loving it. However what I was seeing was the cylinder gap widening up and letting flame escape upwards & outwards due to crushing of the wedges. Thank God it wasn't the cylinder pin cutout that was stretching. Well, two replacement wedges later ($9ea+S&H) and my guns were snug as new but I realized that noise is not power. So, don't be so tempted to load the guns to their maximum potential or you may end up with a stretched cylinder pin which is a more expensive fix. I know of one fellow who sent the barrel assembly down range when he stoked his Walker with full charges of 777. Don't do it (use 777 in a Walker). You will also find the FFg doesn't cause as sharp of a recoil (not an issue with the heavy gun for comfort) so the rammer stays in place. The fffg drops the rammer more often but there is an easy fix for that. Email me for info.