I have no data either... just observation... It makes sense though.... As I used to be able to find H4350 without any problem for loading my 30-06. Fast forward to present day and the last 3 years.... H4350 is now called "UNobtainium".

And when I ask why no one can find, get, or order any for me, the response is "The 6.5 Creedmoor match shooters are buying it all up". and if they're sponsored, then it goes straight to them. I don't know how much fact there is the statement, but it sure is difficult to find more than a pound or two anywhere.