Ok...Update.
I have had some success with RL7 and the 180gr cast. The bullet sized lubed and GC weighs 200gr. I have a load that will do right around an inch at 100 yrds and the speed is 1260 fps.
I also tried the lighter 120 gr LEE bullets I have and I think they feed better than I originally thought. Im going to look at those some more.
The stock on the rifle is flimsy so that kinda makes it harder to shoot consistently. And I agree the 1-7" twist is pretty aggressive for cast bullets. But Im sticking with it. Its a fun round.

Mark