Couple of things to chew on here. The Shikari isn't going to be legal for use in NRA sillouettes. It might be ok in the bptr matches, but it's going to suffer severely when you get past the 300 yd mark with the verticle stringing , that comes from the lock up on that hinged breech..
Your Lee bullet won't hold up much past 200 yds, it's to short with a very low bc to stay stable when getting out into the low velocity at the 300 yd mark and beyond.