No experience with IMR4166 and I dont recall seeing it used in 6.5G. H4895 has good temperature stability and is a popular powder with forum members for 120 grain and heavier bullets.
Using google custom search I found this thread from 2015 which might answer your questions.
https://www.65grendel.com/forum/showthre...MR-Powders
Google custom search link
https://cse.google.com/cse?cx=0163689474...cu1o&hl=en
Using google custom search I found this thread from 2015 which might answer your questions.
https://www.65grendel.com/forum/showthre...MR-Powders
Google custom search link
https://cse.google.com/cse?cx=0163689474...cu1o&hl=en

