As you know I run the 155s as per you recomendation and I much prefer them. I can see impacts and the extra speed is definetly good. When I did shoot with a break it was a dream to shoot. I say that's good advice for now to practice with and when he is ready to rebarrel he can step up to a different cartridge. For now that will shoot really well. I get about 1/4-1/2 moa with the 155s.