Hi Mike, my DW 414SM is a first issue gun that I picked up several years ago. I also have a custom 14" MGM encore barrel. My main go to powder for this caliber is Hodgen's LIL Gun. If this powder is available in your area you might give it a try. The red dot sight is easier for me to use than irons in hunting situations and the encore barrel has a fixed 4x Leupold scope and I like that combo for more accurate shots past the 100yd mark.
It's good to see another 414SM shooter
David