Too Tall, Nosler makes 120 partitions but I dont think they make 120 AB's.
I've loaded for 110 AB's and 115 Ballisitc Silvertips (same as the BT with a coating)
Got 3500 with the 110's using 55 g of RL17
Got 3405 with the 115's using 55 g of RL17
Tried Retumbo and H1000 but they were about 200 fps lower than the RL17
Have you seen this thread?
Masters of reloading