I'm sorry I just read your clarification.
I actually have little experience with this specific situation. By the time I started competing, The caliber restriction was gone and the sub 30's had taken hold. No one was shooting reduced recoil 30's out of a bolt gun. They were shooting 6mm's and 22's. I did play with 125's and 130's out of an M14 (and even 110's). But I had a gas system to account for which limited how low and what type of powder. Things you don't have to worry about.
I think you'll find this thread helpful.
https://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/12517810/1
