I had great luck with those 410 gr. GP conicals out of my CVA last season. With 90 gr. of FF triple seven, they'd group in to 1.5-1.75" pretty consistantly at 100 yards. I haven't had a chance to shoot them out of my KRBas of yet. That'll bedone on the next range visit, when it cools off a bit more.
This is the only thing i hate about triple 7 is that your first shot will be there and then the next 2 will drop a few inches lower.
In 4years of shooting 777,I never experienced that. It's always been a very consistant powder in the rifles I've shot it in.