I use 4.5 of Titegroup with a 115 lead and they shoot just fine. I lower the charge to 4.0 with a 125 grainer, same results. I don't think the Berrys are much harder even with the plating so you should be OK. You need to load 20 rounds with 1 load and try them first, not 150! Work up slowly and you won't have to pull and redo 3 boxes!
If you want your children to follow in your footsteps, be careful where you walk.
Beware the man that only owns one gun; he probably knows how to use it.
I just hope my ship comes in before my dock rots.