I read somewhere that the 30-338RUM has slightly less powder space than the 300RUM; thus, recoils less. What is the powder space (or water vol.) difference? Also, I read that the case is a little shorter and it has a longer neck- does this really help improve bullet seating over the regular 300RUM to be worth the difference? Finally, how difficult is it to slightly shorten the case on the 30-338RUM to reduce capacity a bit more but have the case fit in a standard-length action or finish at about 3.60 OAL (with 200gr. bullets) Thanks !