Thread: Question for the Guru's

243, 260, 708 all have a smaller neck diameter compared to case diameter so need a slower powder to keep pressure down. 2208 is the go to for 308. Surprised 338 federal has 2209 as you would expect a faster powder because of the larger neck diameter, possibly because of the mass of the projectile. General rule, as the mass of the projectile goes up use a slower powder.