This is correct. I am a type 06 FFL and clearly too many people don't know much other than what Hodgdon feeds them.
H110 works well (It is identical to W296) except you pay for the Hodgdon name. IMR is also one of their brands and IMR4227 works really well. I recommend this over all their other powders as it has more variety and typically meters better along with improved accuracy and velocity in most loads. Only one person here was informed enough to know that Hodgdon ISN'T THE ONLY COMPANY TO MAKE POWEDERS.
Since too many people are brainwashed into this idea by the manufacturers. You may use the following powders also
RAMSHOT ENFORCER
ACCURATE 4100
ACCURATE 5744 (This may also be used for subsonic as well)
ACCURATE 1680 (This may also be used for subsonic as well)
I personally prefer to stay away from the (I'm a hobby reloader brands) as they are always out of stock on the 8# kegs of them or the 4# that Cabela's sells. It is rumored that Cabela's has plenty of IMR4227 in stock (I just bought more in a 4# keg - you need to be a 06 FFL or not everyone will sell certain items to you) and it is my recommended load other than the 4100 above for supersonic loads. It meters well (of course almost everything meters well in my equipment but then again, I have the best equipment) and is not too selective in loads. H110/W296 are VERY tempermental to what loads you have if you are one that loads to the maximum. If you do not, you won't get near what people like myself and those I partner with like Liberty, PNW Arms and Remington. These guys don't mess around with volume dispensing (rarely do I except on target ammo). Most of our loads are match, therefore they are VERY consistent and are usually within 25fps or less of each other.
While it's perfectly fine to use Hodgdon powders, so does everyone else and people forget that most people are NOT loading for 300BLK. They are loading for what the powder was originally intended for: magnum pistol loads. My Dad couldn't find a single pound of powder for 357/41 Mag until I gave him a pound of W296. My recommendation, leave those for the revolver folks as its too narrow in pressures to work with for most (unless you are slow enough to hand load them)(I shoot selective fire and full auto at times inside my range so I don't really care to hand load anything). I tried using H110 before it became scarce (now I use it only for 357 Mag) and I can assure you it has very little room for margin and does not beat the velocity offered by most of the other powders.
Hope this helps you find a more constant source of powder. If you need load data, speak with the powder manufacturer and the bullet manufacturer - then compare the two using the starting load and work your way up to see where the max load is. It's what I do all the time with new cartridges and I don't need load data to figure out what is needed and what is not. Rolling your own isn't THAT cost effective nowadays. PNW Arms makes a 147gr non bi-metal cartridge that does just over 2000fps and is only $15 or so. Those who are rolling there own are really not going to get much value out of this unless you are buying these in 10,000 or more of each component and buying powder by the 8# kegs. I do this for a living, I'm not trying to steer you away from a hobby if that's what you enjoy but 'rolling your own' for savings is really not needed any longer. There are too many of us producing this cartridge now and for those chopping down brass, what a PITA. You must be really a glutton for punishment because it takes far too long to do that then just order 10,000 rounds of primed brass (or even unprimed brass). I will state for the record however that those who used Lake City (LCAAP) brass do have one advantage - the cartridges will hold up to more pressure that their manufactured counterparts due to wall and web thickness. This is because that cartridge was developed for 5.56mm at almost Mach 3 not 7.62mm at Mach 1-2
Best Regards,
BT