Do you check with the bullet or the powder manufacturer? I am trying to work up a 243 Win. load using Nosler 100 gr Partition bullets using Hodgdon's H380. I went to Nosler's web site and found the start load listed at 36 grs with a max of 40 grs. I loaded up 5 rounds each starting at 36 grs up to 39 grs in 5 gr increments. While checking for another load using Varget on Hodgdon's web site I noticed they had H380 listed with a starting load of 34 grs. with a max of 36 grs. Granted, the bullet listed on Hodgdon's web site is a different bullet than what I am loading, but still should there be that big of a difference in powder weights for different 100 gr. bullets? So, would you recommend pulling these bullets and use the Hodgdon's data or try the Nosler data?