My question is about how rate of twist effects load data. My BillyMarr/Oldman 6mm TCU barrel has a rate of twist of 1:8. Does not this fast rate of twist have some effect on the choice of loads. Would a 1:12 rate of twist use a different load than a 1:8. If so shouldn't the manuals state the twist rate used in developing the given load, or does it even matter at all. You tell me.