I often seat bullets out so there's just a hint of rifling contact marked and regularly exceed "max" charges, and I find myself getting great-shooting loads over and over again. If you are comfortable being independent from the books, and taking the risk of experimentation, you will probably find yourself able to do the same. I always approach and exceed maximums very carefully, and finish with accuracy as the deciding factor. You need to pay the most attention to the bullets you use, as a high BC will get you further than some speed. In my 7mmRM, I've become a fan of 154gr SSTs...they're affordable and offer me a good BC:velocity and great accuracy. For me, it's a dandy choice.

SSTs offer the same in 277s. 30 cals are still a bit lacking...but this is just me. If you prefer a different bullet manufacturer (like barnes for example), the 30 could certainly be your choice.

Think bullets first, then decide what's gonna throw them.