My first deer was killed with a 6.5x55. I was amazed at the damage it did. I knew then that I didn't need any more power than that. I've almost never loaded a cartridge for maximum power. The '70s era Lyman manual listed their most accurate load, and I always went with that. Never had a problem with a reload except the time I cleaned my cases with WD-40. Worked great, but when I fired at a running elk, it just went click. Turns out WD-40 kills primers.