A lot of 223 Remington bolt rifles come with a 1:9 twist which provides flexibility for shooting bullet weights up to 70 grains or maybe higher in some cases. If you wanted to dedicate a barrel to shooting only 50-55 grain bullets, would a 1:12 twist be a clearly better choice than the 1:9? Would any differences be noticeable to the average shooter? Could the differences be load specific?