Yes, pressure curves definitely come into play but I haven't had any issues with most common 308 powders. Many pressure issues with AR's can be masked with adjustable gas blocks, buffer weights, etc.... I haven't loaded for the M14 rifle but have read where they are a little different when it comes to powder.

John 8:12 "I am the light of the world. Whoever follows me will never walk in darkness, but will have the light of life."