I purchased a 300 winmag recently for my elk hunt this fall. Not having access to any brass and short on time for load development I purchased a couple boxes of nosler custom ammo loaded with 180 grain accubonds @ 2950 fps from Midwayusa. I really like how these loads shoot and would like to find out what they are using for powder. Has anyone played around with this ammo? They might be loaded with a powder that is not available to consumers. I hate when they do that. I checked the nosler website and their most accurate load for the 180 accubonds was with H-1000 but the velocities on the box don't line up with the nosler website. I might be screwed anyway as the local scheel's does not have any brass for the 300 winmag and their selection of powder is very limited right now. I am not able to find any H-1000 locally. I have some H4350, IMR 4350, H4831sc & RL19 available that I use for my other rifles. Any suggestions would be welcome.