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They have a statement on one of their social media pages, I don't recall which one. However, they said that it will likely take until the end of 2020 to get out of their backlog of orders. They're producing as quickly as possible though.
H4831sc & H4831 are the exact same powder but the 'SC' is 'short cut' & a shorter grain over the H4831 which allows for better load density.
Been using the "H-1000" with a 180 gr nosler BT, for years! Never Been any Problum, everything I have shot at went down! 81gr H-1000! Work up your Load slowly and have fun! You will find the right spot for you and your Rifle!
4831seems to be pretty easy to find all the time. I bought lots of it, but see it at the local sporting goods store. It good for all my magnums
I've been using H1000 and IMR7977 for several years in my 7mm LRM, similar to your WM in case size. They turn out very similar in performance. I've found that it usually takes a few more grains of 7977 to match H1000 in velocity. Also, with heavy bullets you might give IMR8133 a try. It is similar to Retumbo in burn rate. Also Vihtavuori N565 and N570 should do really well. The N565 is close to H1000 and N570 is close to Retumbo.
I just checked the Vihtavuori website and they have data for the 300 WM on the N565 and N570 pages. I need to try 565 in my 6.5 PRC.
I don't know what powder you may decide on but I will tell you what I have done. Call Hodgen and find out when they are going to make a run of the powder you want to buy. (I think H1000 is made in Florida.) Then call Midway and reserve 3 kegs, or more if you shoot frequently, ask them when there will be a sale on powder. Sometimes after Midway buys powder and when they have sale, they will offer to pay the freight which is astronomical now on hazmat. When I say Midway buys powder I truly mean it, they will buy railroad cars of the stuff. You can ship 40 lbs. of hazmat in the same box or boxes, so if you have to pay the freight fill 'er up the freight is the same for 1oz. or 40 lbs. I get around 650 charges from a keg of H1000 when loading a 300 WM. I know it is expensive to invest this much money but this is how we that have loaded for years do it. Worse than this is telling your wife that you are going to fork out $1000 bucks for powder and sleeping on the couch hurts my back. If you do this you will probably have enough to carry you through the lean times. Nothing is worse than having $10,000 invested in reloading equipment and nothing to charge with. Most young reloaders get this backwards but there are always some old salts around that might have a little extra powder, primers, bullets, brass or lead you can trade them out of or like me just loan it to them until they can replace it. Good luck and good shooting.
