So far ive only found 2 ways to get a really good burn with max amounts of BH209 and i prefer using both. A fairly tight sabot and a 300gr or larger .45X bullet if its in a 50cal. I haven't had any luck with 44x50 yet and heavier charges, They have either been inaccurate or blew the sabot although i havent used the Smooth Green yet.

100-115gr has given me the best results over the widest range of calibers, sabots and weights. Only 2 max load combos have really been impressive and those were in my 54cal with a 300gr+ and really tight but loadable sabots. Ive got some semi heavy 458s coming to try in the 52cal and was planning on trying them with upto 130gr in the slightly longer LRH barrel. I will try to layout a old sheet or tarp and see what residue is left also. The muzzle flash has also appeared normal to me with all loads but its worth the effort just to see what happens.